Why does your pulse rate increase as your level of activity increases?

Please answer quick!

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

Aparent with freckles is crossed with a parent without freckles. the punnett square shows the possible genotypes and phenotypes of the offspring. which statement accurately describes the probability of phenotypes? a.the offspring are more likely to have freckles. b.the offspring are more likely to have no freckles. c.the likelihood of the offspring having freckles and not having freckles is the same. d.the likelihood of the offspring having freckles and not having freckles cannot be determined.

In what part of the body does the most muscle activity happen?