Explain why the solute and therefore water concentration in the blood remains fairly constant regardless of how much or how little water people drink.

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .