——————-—— is necessary for all life on earth

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.

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

Hershey and chase confirmed that dna, not protein, was the genetic material. how do the results of their two experiments support this conclusion?