What is one reason that a cell needs to regulate flow across the membrane? (points : 1)
the nucleus needs to bring in dna.

the cell needs carbon dioxide as a source of energy.

the cytoplasm needs to bring in organelles.

the cell needs to maintain homeostasis.

After hydrogen and oxygen, witch element makes up almost all of the most common substance in your body

You see a white marker with an orange circle and black lettering. what does this marker tell you

Astudent wants to test the hypothesis that fertilizer improves the growth rate of grass seeds. to test this hypothesis, the student put the same amount of grass seed in 3 containers with the same type of soil. the student measured the growth at the end of the week. all plants received equal amounts of water and sunlight. if you were asked to graph this data, what would you place on the x-axis? a. fertilizer b. water c. plant growth d. week one