What effects do keystone specie shave on an ecosystem?

A. They make prey species extinct

B. They reproduce biodiversity

C. They keep populations of species balanced

D. They cause primary disturbances.

Presumably, the earliest infected cells (target cells) for filovirus (ebola and marburg viruses) infections are?

Which layer is made of solid nickel and iron? A. crust B. mantle C. outer core D. inner core I think it is either the inner core or the outer core.

Nuts are a good source of vitamin E. a. True b. False

What is the term for doctors stopping the treatment of a terminally ill person by turning off respirators or other life-support machines?

1. You are studying a trait in corn that you believe exhibits Mendelian inheritance. You count phenotypes and find that there are 375 of one phenotype and 125 of the other phenotype. When you perform a chi-square test, the chi-square value is zero.

Why does photosynthesis require water? a. because water provides oxygen atoms. b. because water provides electrons. c. because water accepts electrons. d. because water acts as a catalyst.

An education guess or rational explanation about a specific phenomenon

What are the technical name for red blood cells white blood cells and platelets?

What are the resources of the ocean

Which organism actively hunts other