The process of diffusion requires
a. a concentration gradient
b. none of the above
c. atp
d. a vesicle

In which terrestrial biome can you find trees that produce cones instead of flowers and needles instead of leaves? have trees that produce cones instead of flowers and needles instead of leaves. the latitudes in this biome have evenly distributed precipitation throughout the year. is it high or low

2points what do bacteria have in common with the cells of other living organisms?

Which characteristic should describe all evidence collected by a scientist? true obvious objective subjective