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
bagirrra123 [75]
2 years ago
7

How many variables can a scientist change during a scientific investigation?

Biology
2 answers:
Nastasia [14]2 years ago
6 0

Answer:

Three

Explanation:

notka56 [123]2 years ago
6 0

Answer:

Three

Explanation:

You might be interested in
Gregory Mandel‘s work was in the area of?
Vsevolod [243]
The answer is C: Inheritance
4 0
3 years ago
Read 2 more answers
If the integument of an angiosperm seed contains cells with 20 chromosomes, how many chromosomes would you expect to find in the
OleMash [197]

Answer:

30

Explanation:

The seed of an angiosperm is formed as a result of fertilization (fusion of sperm in pollens and the ova from ovary). According to the question, the cells of the seed which will grow into the plant contains 20 chromosomes. Seeds of angiosperms contain a tissue called ENDOSPERM that forms as a result of the unique DOUBLE FERTILIZATION in angiosperms. It occurs when one haploid sperm cell fuses with two haploid polar nuclei to form a triploid endospermic structure that serves as food for the growing embryo in the seed.

Now based on the above explanation, the diploid plant cell with 20 chromosomes will have 10 chromosomes (half as much) in its gametes as a result of meiosis. This 10 chromosomes in each gamete (sperm and ovum) fuses to form a diploid zygote with 20 chromosomes, while one haploid sperm cell (10 chromosomes) also fuses with two haploid polar nuclei (10 chromosomes each) to form a triploid endosperm with 30 chromosomes i.e. 10+10+10.

8 0
3 years ago
The grid-table indicates the level of impact that each of the 5 drivers of biome and ecosystem degradation have had over the las
Anarel [89]

Answer:

You told us the answer to your own question

Explanation:

You put answer :B

6 0
3 years ago
Which of the following is an alternative energy
Dima020 [189]

Alternative energy sources are those that do not deplete natural resources and do not harm the environment.

Options A, B, and C are all fossil fuels, which we know can be depleted and harm the environment.

The only valid option here is D, Geothermal energy.

Geothermal energy is both renewable and environmentally friendly.

5 0
2 years ago
Read 2 more answers
What happens when the muscles in the stomach wall relax and contract?
Norma-Jean [14]

Answer:

the answer is the second option you gave

5 0
3 years ago
Read 2 more answers
Other questions:
  • Is a Cell membrane eukaryote or prokaryotes
    7·1 answer
  • How do i use prokaryotic in a sentence?<br> In another sentence use eukaryotic?
    10·1 answer
  • an unknown cell was identified as being eukaryotic. what structure was identified to positively confirm this?
    6·1 answer
  • How is DNA used as evidence for evolution?
    14·1 answer
  • T = dominant gene for tall plants t = recessive gene for short plants A plant which is short must have a"Tt" gene.
    10·1 answer
  • Referring to lab 4.04 part 1 what percent of the offspring would be heterozygous for white flowers?
    14·1 answer
  • Name and define 3 of the organelles we are learning about
    10·1 answer
  • Which shows the correct order of steps when using wind to generate electricity?
    14·2 answers
  • Based on the graph which of the following could be used to increase the reaction rate beyond point C
    5·1 answer
  • While reading a book, the author describes a cat as being as big as a house. Immediately, you picture a huge cat trying to fit t
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!