The largest mass extinction was in the

a.

Precambrian time.

c.

Paleozoic era.

b.

Cenozoic era.

d.

Mesozoic era.

The ages of the winners of a cycling tournament are approximately bell-shaped. the mean age is

What is the carbohydrate formed in photosynthesis?

At which body temperature does the blood pressure of a victim of hypothermia become obtainable only by doppler?

Where in an embryo are the instructions located for how to build organs? A. Amino acids B. Nucleus C. Endoplasmic reticulum D. Ribosomes

Give an example of an amimal that can be both predator and prey. Explain how this works

Why is it necessary to do a spinal tap when you suspect a bacterial infection of the central nervous system? why can't you use a blood test?

Name the major greenhouse gasses and how they get into the atmosphere

Which type of cell goes through the determination process?

What organic molecule is the basis of enzymes.?

Which transport mechanisms require the formation of a vesicles to transport material into or out of the cell? A: diffusion and osmosis B: exocytosis and calcium pumps C: exocytosis and endocytosis D: diffusion and facilitated diffusion