What is/are agctu in a dna sequence?

A, G, C, T, U are the nucleotide bases which are present in the DNA and RNA. In DNA, adenine (A), guanine (G), cytosine (C) and Thymine (T) are present. In RNA, adenine (A), guanine (G), cytosine (C) and Uracil (U) are  present.

Adenine (A) and Guanine (G) are purines.

Cytosine (C), Thymine (T) and Uracil (U) are pyrimidines.

Adenine (A) pairs with Thymine (DNA) and Uracil (U) in case of RNA.

Cytosine pairs with guanine (G).

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:

archaebacteria are found in in forest soil.

hope i spelled it right lol

hope i

-lavira: )