Pls help for a and b and if possible pls give an explanation but you don’t have to!

Embryos of different species look very similar, which shows that the organisms share a ancestor.

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles

Isopropyl alcohol, (ch3)2choh, is a common solvent. determine the percent by mass of hydrogen in isopropyl alcohol. a) 6.71% h b) 13.4% h c) 25.0% h d) 53.3% h