Which of these events occurs first? select one:

a. cleavage

b. implantation

c. formation of the placenta

d. gastrulation?

Which of the following are found primarily in the intestines of humans? A) Gram-negative aerobic rods and cocci B) Aerobic, helical bacteria C) Facultatively anaerobic gram-negative rods D) Gram-positive cocci E) Endospore-forming rods

Extensions from megakaryocytes that extend through blood vessel walls in red marrow are sliced off from the cells by the force of blood flow. these extensions are

How would you advise someone who is worried about chemicals in food

Water droplets form in the atmosphere via a small particle called a A. condensed air. B. condensation nucleus. C. conditioned nucleus. D. particle gypsum hydration.

What type of gland in the skin produces sweat?

If the same parents have four boys, what is the probability their fifth child will be a girl?

Natural selection is often called survival of the fittest. However, often times breeding or artificial selection will create offspring create population different from the population of their ancestors.

Explain how micro evolution and migration can effect an ecosystem

What do all viruses have in common?

Sheath of schwann cell containing cytoplasm is called