1) Scientists have found that all living organisms contain an enzyme called Cytochrome-C. Comparing the amino acid sequence of this protein shows the genetic similarities between the two organism. This is because

a strand of DNA is made up of repeating amino acids
all proteins are found embedded within the organisms DNA
amino acids code for the order of nucleotide in DNA
DNA codes for the sequence of amino acids in a protein

2)In a population of lizards, allele T (TT and Tt) codes for long tails. The frequency of allele t (tt) which codes for short tails is 60%. In this population, it was found that having a longer tail tricked the predators into thinking it was a snake and scared them away, which of the following is most likely to occur over time.

there will be no change in frequency since T is dominant
the frequency of the two alleles will change until they both equal 50%
the frequency of T will increase, and t will decrease
the frequency of T will decrease since it is dominant

3)Which event may lead to speciation?

different species live together on an island
a population is divided by the formation of a river valley
two populations join together
a new island is formed from a volcanic eruption

4)Within a population of squirrels, having a very short tail keeps predators from catching the squirrel while on the ground. Having a long tail is good for balance when in the trees. Having a medium length tail is not beneficial. What type of natural selection is most likely to occur?

evolutionary selection
stabilizing selection
disruptive selection
directional selection