2.Horse skeleton fossils indicate that the size of horses increased over time. Which statement best
explains this fossil record?
A. Smaller horses bred with larger horses, creating
hybrids.
B. Smaller horses were infected by a fatal virus
early in their history.
C. Larger horses consumed the food supply of the
smaller horses.
D. Larger horses produced a slightly greater
number of surviving offspr

carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate     (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.

the answer to your question is slate

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".