A sample initially contains 3.6 moles of a radioactive isotope. How much of the sample remains after four half-lives

Monkeys and bats have similar bone structure in their forelimbs. however, monkeys have longer forelimbs to use for climbing and swinging in trees. bats have shorter forelimbs to use for flight. which term best describes how monkey and bat forelimbs are related to each other? a. homologous b. embryonic c. analogous d. vestigial

What shape would a molecule with two bound groups and two lone pairs have?

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?