Agated channel in a cell membrane allows

osmosis
simple diffusion
active transport
facilitated diffusion

The series of transgressions and regressions that produce cyclothems were likely produced by

The first signs of cellular differentiation occur in the blastocyst. why is cellular differentiation important for the development of a fully formed human infant?

Which of the following would be a body response when stepping outside without a coat on a snowy day? a. senaceous glands. secrete more senum b. more liquid is transported by the body to the skin fir insulation c. blood vessels in the skin narrow and contract d. blood vessels in the skin expand