Oxygen moving from the bloodstream into a cell down a concentration gradient is a form of
a: osmosis
b: endocytosis
c: active transport
d: passive transport

Modern whales developed their traits through natural selection what occurs during the process of natural selection

Need an answer asap 45 points and brainlest to the first person to answer why do scientific theories, such as biological and chemical evolution, represent the strongest explanation of the changes observed in the fossil record. must be in sentence form how can scientific theories on evolution and the fossil record change over time? must be in sentence form

Facilitated diffusion move large molecules and/or polar molecules across the cell membrane. what does facilitated diffusion use to do this?