When asked to analyze a sample of marine life, you notice the animal has an incomplete digestive tract, stinging cells, and swims by propeling water through itself. You conclude that you are observing a cnidarian polyp. True or False

The correct option is;

True

Explanation:

The digestive system of Cnidarians is incomplete having only one single opening which is the gastrovascular cavity the representing the anus and the mouthof the Cnidarians

The hollow body of the Cnidarian polyp which allows water through has tentacles at the top bearing cells meant for stinging

A prey caught by the tentacles is drawn in to the mouth and ingested

The Cnidarians are able to attach to surface due to their attachment adapted lower end

The correct option is therefore true.

cramming before a final is bad because it makes a student's stress level higher. students who embrace cramming to get through a final exam week find themselves struggling to perform consistently, once the brain adjusts to prolonged sleep deprivation.

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: