5marine science questions? will award everything! 1. goldfish, tilapia and barracuda belong to which class of fish?
a. osteichthyes
b. chondrichthyes
c. agnatha
d. countershaded 2. lamprey and remoras belong to which class of fish?
a. osteichthyes
b. chondrichthyes
c. agnatha
d. countershaded 3. while fishing you reel in a fish that you've never seen before. it is a dark blue-grey on its dorsal (top) side and white on its ventral (underbelly) side. what type of coloration does this fish demonstrate?
a. disruptive
b. cryptic
c. predatory
d. countershade

a, i am pretty sure.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation: