Which of the following would be a best choice as a core for an electromagnet?

A. Plastic straw

B. Copper wire

C. Iron nail

The phosphate transport system in bacteria imports phosphate into the cell against the phosphate concentration gradient.

In a scientific experiment, a is any factor that can change or be changed

Systolic blood pressure refers to pressure applied to the walls of the arteries when

How does the ocean conveyor belt affect the climate in western europe?

Which planet has an orbit shaped most like a circle?

How does population size related to resource availability in an environment

Homologous structures are those that:

What did Darwin think about Earth and life while he was forming his theory of evolution? A Earth changes slowly over time, so populations might, too. B Earth might cause fast, rapid changes in the traits of individuals.

Why do amoebas change shape?

Microscopic organisms with calcium carbonate shells are called.