The half-life of a radioisotope is the amon the symbol 42he, the subscript 2 is the for helium and the superscript 4 is the for helium. unt of time it takes for

Which of the following is not a characteristic of natural selection? 100 points pls more offspring are born than will survive to reproduce. mutations appear randomly breeding pairs are chosen by humans organisms that are better adapted are more likely to survive

Which system revise and send electrical signals throughout the body

Cell specialization occurs by the process ofa. reproductionb. differentiationc. maturationd. growth