1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Lesechka [4]
2 years ago
13

I REALLY DO NEED HELP PLEASE!

Biology
1 answer:
Lena [83]2 years ago
8 0

Part (a)

Enter the data into your calculator or a spreadsheet. Then perform an exponential regression to find the curve of best fit. This is the closest exponential function we can assign to each population, to measure it's approximate growth.

Let functions f, g and h represent group 1 through 3 in that exact order. You should get these approximate functions:

  • f(x) = 6830.52397(0.92755)^x
  • g(x) = 3969.81548(1.00295)^x
  • h(x) = 5.67328(1.42775)^x

Note: Group 3 doesn't have its population start until 1995, which is 10 years after 1985. This means h(x) only works when x \ge 10 or it's meaningless otherwise.

Each function found is of the form y = a*b^x, where 'a' is the initial population (at time x = 0) and b helps determine the growth rate. We set b equal to 1+r and solve for r to get the growth rate.

For f(x), we have b = 0.92755 approximately. Set that equal to 1+r and solve for r

1+r = 0.92755

r = 0.92755-1

r = -0.07245

The negative growth rate indicates we have population decline. Specifically, the rate of decline is about 7.245%

Repeat those steps for the b value of g(x) and you should find that r = 0.00295 meaning we have roughly a 0.295% increase for Mussel group 2.

Group 3 has a growth rate of about 42.775% due to r = 0.42775 in this case. The steps will be the same as for group 1.

=========================================================

Part (b)

The graph is shown below as an image attachment. I used GeoGebra to make the graph, and to also find the exponential regression equations.

We have x as the number of years since 1985, which is the starting point, and y is the population size. Something like (0,4800) means in the year 1985, the population is 4800 mussels (see group 1).

Keep in mind that the green curve for h(x) doesn't make sense for positive x values smaller than 10, due to the fact that the third group wasn't introduced until 10 years after the starting point of 1985.

Also, be sure not to think that the blue g(x) curve is linear. It looks like a flat line, but it's really a very stretched out curve. This is because the growth rate is very small.

=========================================================

Part (c)

It appears that group 3 has caused group 1's population to decline, due to the red points (see part b) going downhill as we move from left to right. This drop-off occurs at around the time group 3 is introduced. Strangely, only group 1 is affected while group 2's population is still increasing. This increase is not much, but it's still a positive growth rate. So it's fairly likely that there are other confounding variables to consider, and it's not entirely group 3 that's causing the trouble.

=========================================================

Part (d)

There are many ways that people impact their environment, whether it's a positive or negative impact. When regarding this topic of marine life, specifically mussels, one way that humans affect the population is what was mentioned earlier: The fact that the third group of mussels was introduced to the habitat. Often, though not always, if you introduce a new species to some environment, then the species of animals already living there may have a hard time coping with the newcomer. The new species would be referred to as "an invasive species". The invasive species is more aggressive at getting food to crowd out the older species that isn't used to the newcomer. This may explain why Mussel group 1 experiences a decline after 1995 when group 3 is introduced. This decline is fairly significant as the graph in part (b) shows.  Group 2 doesn't seem to be affected at all since it's growth rate is fairly flat yet steadily increasing even if done slowly. It's possible that group 2 is simply more adapted to deal with competition better than group 1.

Another way humans impact the environment is through pollution. Air pollution may contribute to acid rainfall that would lead to the ocean. There's also chemical pollution such as flushing harmful chemicals down the drain, which also leads to the ocean. This could apply to the average consumer, or to very big industrial companies. For instance, in the news recently in Florida, there was a very big worry that a holding pond could contribute to a spike in algae growth. While algae are beneficial, there are some species that invade more than their fair share of resources and kill off anything else more or less. This is one example where pollution contributes to harmful consequences to unfortunate species who likely die off. On top of pollution, there's general habitat loss that also may explain why group 1 is experiencing a sharp decline (however it wouldn't explain why groups 2 and 3 are growing).

You might be interested in
Write components of xylem and phylem ?
aleksandrvk [35]
  • Xylem contains tracheids, vessels, xylem parenchyma and xylem fibre.
  1. Tracheids: They are elongated, tubular dead cells with tapering end walls.
  2. Vessels: These are also known as trachea. They are elongated, tubular dead cells. They are joined to each other by end to end forming a continuous pipe. The cells are thick and lignified.
  3. Xylem parenchyma: They are also called wood parenchyma. This is the only living tissue of xylem.
  4. Xylem fibre: They are dead cells with thick walled fibre.

  • Phloem consists of sieve tubes, companion cells, phloem parenchyma and phloem fibres.
  1. Sieve tubes: These are elongated, tubular living cells arranged in a row, with their perforated end walls forming a sieve. They are non-nucleated. Their protoplasm are inter-connected through sieve plates. They possess vacuoles.
  2. Companion cell: They are elongated, lens-shaped cells containing dense cytoplasm and prominent nuclei. These cells maintain connection with sieve cells through pits.
  3. Phloem parenchyma: They are living thin walled parenchyma cells.
  4. Phloem fibre: They are also known as bast fibre. They are elongated fibre like sclerenchymatous dead cells with thick walls containing pits and interlocked ends. Phloem fibre are the only dead cells in phloem.

Hope you could get an idea from here.

Doubt clarification - use comment section.

5 0
2 years ago
Where does X go on the diagram?
Deffense [45]

Have you tried on the oviaducts im not sure but try it

4 0
3 years ago
Read 2 more answers
Why is the aplysia such a popular animal for single-cell studies of learning?
Feliz [49]

<span>Aplysia is a marine gastropod mollusc which is an often used model organism in neuroscience, especially on the cellular biology of learning and memory. What makes them easy to work with are their giant neurons, which are one of the largest. Aplysia neurons are suitable for studies of how neurons and neural circuits control behaviours. Its defensive reflex has been studied because it is mediated by electrical synapses, which allow several neurons to fire synchronously.</span>

5 0
3 years ago
Liverworts, mosses and hornworts are non-vascular plants that reproduce by forming
iragen [17]
I am gonna say answer b. Spores
3 0
3 years ago
In which cell is a mutation most likely to affect the next generation?
salantis [7]
They occur in germ cell DNA, which are the cells that create sperm or Ova. For every 85 million nucleotides assembled in DNA during human sperm or Ova production, One will be a mutation
4 0
3 years ago
Other questions:
  • Which of he following is a coast of urbanization
    9·1 answer
  • HELP PLZ!
    12·1 answer
  • Question 4 Unsaved
    7·1 answer
  • The name given to the metabolic pathways in which cells harvest energy from food molecules is
    8·1 answer
  • Consider the food chain of grass → grasshopper → mouse snake → hawk. About how much of the chemical energy fixed by photosynthes
    15·1 answer
  • What would IC 559 be classified as
    14·2 answers
  • The epicenter of an earthquake is the area where the least amount of damage takes place.
    7·2 answers
  • Why does chemotherapy cause side effects such as nausea?
    8·1 answer
  • Anyone here let's ch.at na yrr...What is the impact of world war 2​
    7·1 answer
  • Easter Island is described as having a mild climate and fertile soil, which should be favorable for a diversity of organisms. Wh
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!