When precapillary sphincters are closed, blood flows through the shunts and bypasses the tissue cells. when precapillary sphincters are closed, blood flows through the shunts and bypasses the tissue cells. a. true b. false?

Mutations associated with albinism affect proteins involved in synthesis

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

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