Many different groups of cells working together

A man with type AB blood is married to a woman with type O blood. They have two biological children, and one adopted child. The children's blood types are: A, B, and O. Which child was adopted?

What are three significant differences between meiosis 1 and meiosis 2

If a person has memory B cells against a certain pathogen, the person is ... a) likely to develop that disease b) much less likely to develop the disease a second time c) able to spread the disease to others through physical contact d) probably

Water in the solid phase has a crystal structure which keeps molecules farther apart than water at certain temperatures in the liquid phase.

Anybody else has a di*k for a brother?

According to the Hardy-Weinberg principle, genetic equilibrium would be more likely in a population of mice if :

True or false particles such as sand move in flowing water by

A minimum of how many minutes is need to achieve the benefits of Cardiovascular activity

Chimpanzees reproduce sexually, and sponges reproduce asexually. What disadvantage do chimpanzees have compared to sponges

What is the immune system? A. The group of cells and organs that protect the body from disease. B. A group of cells that undergoes apoptosis to protect the body. C. A group of organelles that digest particles that invade the cells. D.