Describe the mechanisms in place to prevent the blood from flowing in the wrong direction through the heart.

Why is the nervous system referred to as the communication system?

Which term describes a pure substance that is made up of only one type of atom?1) matter2) rock3) compound4) element

Select the correct answer. in a family, the father is affected by a genetic disorder. The son in the family has the same disease, but the daughters do not have it. What type of inheritance is this? A. Y-linked B. X-linked C. Polygenic D. Codominant

What is the correct scientific notation form of 541

What cells in the body are most likely to have originated through the process of meiosis?

Give two abiotic factors which will affect the growth on a school playing field

What are the big four macromolecules common to living organisms, what are the subunits of each?

Match each process to the sphere at most directly involves

What are the four basic needs all living things must satisfy

What property makes water molecules stick together?