the bodys first line of defense against the enviroment, disease, parasites, and injury is made up of A.) blood cells B.) muscle cells C.) nerve cells D.) skin cells

A set of biotic and abiotic conditions in which a species can survive and maintain a stable population is known as _? (A) niche (B) ecosystem (C) habitat (D) biome

A child has a sore throat. The mother takes the child to the doctor. The doctor says that the child has a bacterial infection. Explain how the infection makes the child ill.

When larger meteorites hit earth, what do they create

All scientists agree that global climate change will happen rapidly.

An inability to be roused, a weak, rapid pulse, and irregular breathing are signs of

Why is mitosis responible for for growth, repair, and maintence

Explain one way in which a hormone can prevent contraception

1) Which of the following explains why a bone in a bird's wing is homologous to a bone in a lizards leg? A) The bones in the two species provide for the same type of motion.

Do plants provide an important contribution in shapingof the environment?

Two people are standing together in an elevator, but they do not speak to each other or look each other in the eye. erving goffman called this type of interaction