Agated channel in a cell membrane allows

osmosis
simple diffusion
active transport
facilitated diffusion

What is thought to have caused the mass extinction at the end of the cretaceous period?

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

During the day, plants produce by splitting water molecules in the light-dependent reactions of photosynthesis. at the same time, plants use cellular respiration to produce some of the needed by the light-independent reactions to make sugars. during the night, plants produce because takes place.