Explain the use of Molecular clocks

The distant ancestors of tigers may have had bodies without stripes. use the theory of natural selection to explain how tigers may have evolved to have stripes.

Slow down transpiration by the stomata question 9 options: a guard cells; closing b chloroplasts; closing c guard cells; opening d chloroplasts; opening

Add solid urea to a beaker of water. the beaker gets very cold. is δh favorable or