Which direction do molecules move during facilitated diffusion?

A. low to high concentration

B. high to low concentration

C. against the concentration gradient

Which blood component makes up 41% of the blood's volume? O plasma red blood cells platelets white blood cells

What affect does a keystone predator have on its habitat

Inner Planets Test 1. The planet closest to the sun is a, Venus c. Mars b. Earth d. Mercury 2. Which inner planet has 2 moons?

Which of the following statements about erosion is true? a Movement is not required for erosion to take place. b Erosion occurs as a result of drastic changes in temperature. c Erosion occurs when wind or water moves over sediment, soil, or rocks.

Based on information in graph 3, chum salmon fry are likely to eat prey that is

What the primary succession in a ecologic succession?

Ecologists mainly study green plants yes or no?

What is the gestation period for cats

Which human activity directly affects the quality of freshwater resources

True or false? One possible way to alter chromatin structure such that genes could be transcribed would be to make histone proteins more positively charged.