What type of scientist study how energy is transmitted by water waves?

In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

Asmall number of finches are removed randomly from the wild and placed in a protected bird area. they are given as much food as they need and have plenty of space. why would natural selection not occur in this population? a. there is no reason for genetic mutation to occur. b. the birds compete for limited resources, c. the population has not reached carrying capacity. d. there is no genetic variation in the finches.

20 the compound al(nh3)2 has atoms of nitrogen.