Which mechanism requires energy?

A. diffusion of oxygen into a red blood cell

B. diffusion of ions through a potassium channel

C. osmosis

D. exocytosis

What is directly responsible for an acquired trait

Why to introduced species thrive and multiply so easily in their new habitats

Protein a is a chain of 660 amino acids. protein b is a chain of 11 amino acids. how many times as many amino acids does protein a have than protein b?

Normal mice gametes contain 20 chromosomes. how many chromosomes do normal mice zygotes contain?

What is the stinging organelle of paramecium that assists it in capturing large prey?

In cellular respiration, the energy for most ATP synthesis is supplied by: A. High energy phosphate bonds in organic molecules B. A proton gradient across a membrane C. Converting oxygen to atp D.

Two factors which cause global climate change are listed below. factor 1: mountain building. factor 2: changes in the amount of atmospheric gases. which of these statements is correct about the two factors which cause global climate change?

Is a post oak tree is a autotrophic or heterotrophic

Which of the following statements about wetlands is true

Primary succession is most likely caused by (A) Clear Cutting (B) Climate Change (C) Volcanic Eruption (D) Introduced Species