If Adenine makes up approacimately 23% of the nucleotides in a sample of DNA from a leaf cell, what percent of the nucleotides will be Thymine? A)46

B)27

C)23

D)54

Which of the following will not cause mass extinction? a. drastic change is weather b. geological change c. both a and b d. none of the above

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.

What do you need to use in order to work as an environmental scientist? you need to use the scientific method and__ in order to work as an environmental scientist.