Explique o que acontece quando o gás oxigênio e o dióxido de carbono chegam aos alvéolos pulmonares. e qual o nome desse processo?

20. in humans, freckles are dominant to no freckles. trey has no freckles and his wife anna grace has freckles, but her dad doesn't. they want to know what percentage of their kids would look like trey. show a punnett square to support your answer.

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome

Are the layers of rock above and below the coal older or younger?