What broad characteristics do biologists use to group living things into kingdom? Please help..

One of the functions of the endocrine system in the body is to what

At school, there have been a lot of rumors going around about how certain sexually transmitted diseases are spread. which skill would be most valuable to you take the necessary steps to learn what you need to know to protect yourself? a. self-direction b. critical thinking c. problem solving d. effective communication       select the best answer from the choices provided.

During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4