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
mihalych1998 [28]
3 years ago
12

Water fleas (Cladocera) are small freshwater crustaceans. They are filter feeders can are about 3-5mm long. The outer carapace o

f a water flea is transparent so the internal organs can be observed. Caffeine raises the heart rate of humans. Hanna predicts caffeine will have the same effect on other organisms. She uses the water flea as her test subject in an experiment. Hanna introduces varying amounts of caffeine to water flea populations. Using a microscope, she measures the heart rate in beats per second of sample water fleas. She records the data in a table. As the concentration of caffeine increases, Hanna observes the water flea heart rate also increases. What is the hypothesis in Hanna’s experiment? A) Caffeine raises the heart rate of humans. B) Water fleas prefer caffeine over plain water. C) Caffeine increase the heart rate of the water flea. Eliminate D) The effects of caffeine are the same on all organisms.
Biology
1 answer:
quester [9]3 years ago
3 0

Answer:

The Answer is C.

Explanation:

sorry i took awhile

You might be interested in
Which of the following is an inference instead of an observation? Please answer correctly and show how it's correct maybe
SashulF [63]

Answer:

D

Explanation:

A, B, and C, are all observing the situations, while D states the deer walked down the path earlier because of the tracks, this is hardly obersavable, and you would have to infere the deer took the path early.

8 0
3 years ago
The infliction of physical pain upon an offender is called
Lelechka [254]
Corporal punishment
5 0
2 years ago
What is olfactory receptor????<br><br><br>First time....3rd​
Bumek [7]

Answer:

It is a type oe of receptor present in our body

Explanation:

It's is a type of receptor located in our noses which Helps us to smell different things. Some times when we get a cold the olfactory receptors get blocked and this prevents us from smelling things. And this also effects our sense of taste

3 0
3 years ago
Read 2 more answers
The Earth contains a great diversity of species. This:
True [87]

Answer:

The correct option is A) will make no difference in the survival of life if there were major changes in the environment.

Explanation:

Due to genetic diversity, variations in species are caused which makes some organisms of a species to be better adapted than other members of the species. These variations cause organisms to survive when differences in the environment occur. Although the allele frequencies might change due to the changes in the environment but the phenomenon of genetic diversity allows life to sustain on earth even when conditions will become unfavourable.  

8 0
2 years ago
1. How would the temperature changes in the atmosphere enough to affect the hydrosphere lithosphere and bisophere
elixir [45]
If the temp.rises then it will lead to excessive evaporation in hydrosphere, on lithosphere it willl cause extreme hot conditions and with the scarcity of water the animals, birds will die and also plants will be affected.Hydrosphere and lithosphere are included in biosphere so it willl altogether effect biosphere...
6 0
3 years ago
Other questions:
  • An active cell(such as a muscle cell) requires lots of ?
    12·2 answers
  • Which of the following best explains how a scanning electron microscope is used to produce an image of a specimen? An electron b
    13·2 answers
  • Structures that no longer serve their original function are called _____ structures.
    10·1 answer
  • What is the fastest time of growth in a person's life?
    11·1 answer
  • Giving brainiest! Please help ASAP!!!
    9·1 answer
  • Which of the following is mismatched? Group of answer choices Ehrlich – "magic bullet" theory Fleming – initial identificati
    13·1 answer
  • If 60 seconds are in a minute, 60 minutes in an hour, and 24 hours in a day, then 86,400 seconds are in a day. What type of reas
    11·2 answers
  • In this assignment, you will apply concepts of statistics and probability to answer questions about how environmental factors af
    5·1 answer
  • PLS PLS HELP
    13·1 answer
  • All of our planets and our Sun travel around the Milky Way
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!