Which cell structure do nutrients pass through to enter a cell? (A) cell membrane (B) cytoplasm (C) chloroplast (D) nucleus

Scientific thinking: what clues about biology might road kill provide?

How is the male reproductive system different from other body systems? it isn’t necessary to vital signs. it monitors other body systems, and adjusts if necessary. it transports items from one system to another. it is the only system that produces hormones in the male.

What percentage of light hits earth's surface directly?