14) oxygen-15 has a half-life of 2 minutes. how old is the substance after 5 half-lives?

List the two type of transporst that the cell in orde to transport molecules acroos the membrane

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

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