The outer layer of a human cell allows some substances to pass through but keeps other substances out. what is the name of this layer?

a. cytoskeleton

b. cytoplasm

c. membrane

d. skin

On a separate sheet of paper, write a paragraph explaining how genetic variation and environmental pressures can lead to a change in the characteristics of a population.

How do blood clots affect the nervous system

Reptiles, such as the thorn devil and Gila monster, can be found in the middle of deserts, whereas most amphibians do not stray too far from water.

Define the first and second laws of thermodynamics.

Put the following steps of the convection process in the correct order. 1. Gravity pulls cooler matter downward. 2. The matter expands and decreases in density. 3. An up-and-down flow of matter produces a convection current. 4. Matter is heated. 5.

A concept which suggests that a historical event affects a cohort differently than it affects subsequent cohorts because of the life phase in which it occurred is called: A. historical effectsB. cohort effectsC. aging effectsD.

What do conservation biologists who adopt the small-population approach study?

DNA is different from RNA in its function and also in its structure. DNA contains sugar and RNA contains sugar.

Which habitat is characterized by permafrost? O A. Desert O B. Forest O O C. Tundra D. Grassland

In the ocean, small remora fish are often found cleaning bacteria and other parasites from the mouths and gills of swordfish. Which of the following phrases best explains this interaction? A. animal affecting the life of an animal B.