Which statement correctly compares nucleic acids and carbohydrates?

a) they both contain phosphorus, but only nucleic acids contain hydrogen.
b) they both contain carbon, hydrogen, and oxygen in a 1: 2: 1 ratio.
c) they both contain carbon, but only carbohydrates contain oxygen.
d) they both contain carbon, but only nucleic acids contain phosphorous.

Modern whales developed their traits through natural selection what occurs during the process of natural selection

Which statement describes compounds a. compounds are made of one type of atom. b. compounds cannot be represented by models. c. compounds are represented by chemical formulas. d. compounds cannot be broken down into simpler forms.

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.