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
Levart [38]
3 years ago
7

A group of students designed an experiment to determine the effect of compost on the germination and growth of plants. The stude

nts set up experimental plots by mixing different ratios of soil and compost. They planted 20 pea and 20 melon seeds in each plot and watered each plot regularly. The students recorded the number of seeds that germinated, and as the plants grew, they recorded plant length, number and size of leaves, and general health observations. The following observations were recorded. In all treatments, more pea seeds germinated than melon seeds. There was a week of rainy weather at three weeks. Melon plants developed a fungal growth at four weeks. Melon plants grew longer than pea plants, but many melon leaves showed signs of yellowing as the weeks passed. The students concluded that pea plants grew better in compost than did melon plants. Which of the following best addresses the validity of the conclusion made by the students?
(A) The conclusion is valid because the independent and dependent variables in experiment were controlled.
(B) The conclusion is valid because the experimental design included in a large sample size.
(C) The conclusion is invalid because other variables in the experiment (both biotic and abiotic) affected the results.
. (D) The conclusion is invalid because the units of measurments were not given in experimental design.
Biology
1 answer:
pshichka [43]3 years ago
3 0

Answer: (A) The conclusion is valid because the independent and dependent variables in experiment were controlled.

Explanation: There are some basics requirements in order for an experiment to be valid: hypothesis, monitoring, independent and dependent variables and constants.

You might be interested in
Where does organic and inorganic matter come from that is dissolved in ocean water? what about gases?
kvasek [131]

Answer:

Processes involving dissolved and particulate organic carbon are of central importance in shaping the chemical character of seawater. Marine organic carbon principally originates in the uppermost 100 metres of the oceans where dissolved inorganic carbon is photosynthetically converted to organic materials.

Explanation:

<u>h</u><u>o</u><u>p</u><u>e</u><u> </u><u>i</u><u>t</u><u> </u><u>h</u><u>e</u><u>l</u><u>p</u><u>e</u><u>d</u>

7 0
3 years ago
Read 2 more answers
The process of evolution is based on _____. phenotypic inheritance genotypic inheritance
Afina-wow [57]
The process of evolution is based on the genotypic inheritance as the genes changes overtime.
5 0
3 years ago
Read 2 more answers
HELP PLZ
Murljashka [212]

Your answer would be A. Phosphorus


8 0
3 years ago
Read 2 more answers
How is hair grown? give me a really really really detailed answer​
Rainbow [258]

Hair grows out of little pockets in your skin, called follicles. Here's how it happens:

Your hair begins growing from a root in the bottom of the follicle. The root is made up of cells of protein.

Blood from the blood vessels in your scalp feeds the root, which creates more cells and makes the hair grow.

The hair gets pushed up through the skin as it grows, passing an oil gland along the way. The oil gland adds oil to the hair and keeps it shiny and soft. It can make it greasy, too. That's why you need to wash your hair.

The hair dies by the time it is long enough to poke out through the skin. Yes, hair is dead. That's why it doesn't hurt to get a haircut.

Hair on the rest of your body goes through this same process, but the whole cycle only lasts for a month or so. That's why body hair does not grow very long in length like the hair on your head does.

Here are some facts about follicles and your hair:

You are born with all of the follicles you will ever have — about 5 million.

You have about 100,000 follicles on your scalp, which is the skin on your head.

Hair grows very fast and male hair grows faster than female hair. The only part of your body that grows faster is bone marrow, the soft stuff inside your bones. The hair on your head grows about 6 inches a year. So, even though it's one of the fastest-growing things on your body, it takes a while to grow it really long.

Some follicles stop growing hair as you get older. This happens more in some people than in others. That's why some people get thinner hair when they get older, or go bald.

3 0
3 years ago
Suppose you increase your walking speed from 6 m/s to 11 m/s in a period of 3 s. What is your acceleration? Answer and units
Alexandra [31]

Acceleration  of a body is defined as rate of chance in velocity with respect to time and its S.I. Units are meter/sec^{2}/ or m/s^{2}

Magnitude of average acceleration of a body = (final speed - initial speed)/time interval = (v- u)/t

where, final speed =v= 11 m/s; initial speed = u = 6 m/s; and time interval = t = 3 s

Hence acceleration = (11-6)/3 = 5/3 = 1.67 m/s^{2}

4 0
3 years ago
Read 2 more answers
Other questions:
  • A newly formed lake is most likely _____.
    10·1 answer
  • Jorge, who just finished a large dinner an hour before, is offered a slice of pizza by his roommate. jorge says, "no thanks. i'm
    14·2 answers
  • Plants use carbohydrates to build things such as cellulose. How do plants acquire these building blocks to build mass?
    12·2 answers
  • Fragments of metal or rock which enter the Earth's atmosphere from space are called:
    12·2 answers
  • At age 79, Mrs. X is diagnosed with a disorder that severely impairs her logical judgment. Medical imaging techniques show that
    6·1 answer
  • Select all that apply! Chromosomes _____.
    13·1 answer
  • Can sugar and water be separated using distillation?
    13·1 answer
  • Why do you think Elodea
    6·2 answers
  • Iron rich deposits that formed about 2 billion years ago have red layers. Layers formed before then were not red. The red layers
    5·1 answer
  • A newly discovered disease features DNA methylation at cytosines outside of the CpG context. Which cells were most likely involv
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!