Which was Charles Darwin’s contribution to the study of biology? a He explained how traits are passed from parents to offspring. b He was the first person to recognize that organisms change over time. c He believed that organisms adapted through the inheritance of acquired traits. d He proposed that natural selection is the primary mechanism of evolution.

Ahypothesis that has been tested again and again , with similar results each time may become a law , true or false

Because of its structure the cell membrane is known as a phospholipid ? a.bilayer b.molecule c.fluid d.barrier

How do tides affect the organisms living in intertidal zones? a. no organisms live in intertidal zones due to the tumultuous environment. b. the mechanical forces of the waves keeps the organisms clean. c. only plants live in intertidal zones because the animals float away with the waves and never return. d. the mechanical forces of the waves can dislodge the organisms from their habitat.