What is the natural tendency of molecules to spread from an area of high
concentration to an area of low concentration?
A. Vesicle
B. Active transport
C. Passive transport
D. Diffusion

What is true of all organisms in the kingdoms protista, plantae, fungi, and animalia? a. they are multi-celled. b. they are photosynthetic. c. they have cells that contain membrane-bound organelles. d. they contain cells that lack membrane-bound organelles.

Crossing over and independent assortment are important activities that occur during meiosis. what is the significance of these activities

Several billion years ago which gas was the least prevailant in the atmosphere