The sled with a rough metal bottom would take more force to move over ice, because the rough surface would increase friction and the force needed.
Answer:
Proteins are responsible for the <u>mass </u>and <u>fat </u>of much of our bodies (and other organisms). The instructions for making protein are encoded in <u>DNA</u>. These genes provide the sequence of building blocks known as <u>nucleotides</u>. This string of amino acids then folds into different shapes. The structure of proteins determines what a <u>molecule </u>can do. Proteins contain carbon, hydrogen, oxygen, and nitrogen.
Explanation:
<em>Kindly pardon me: I ain't so sure of the first two answers.</em>
Opportunistic infections are infections that occur more frequently and are more severe in people with weakened immune systems, including people with HIV.
<span>increased crop yields Because i looked it up lol
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