The number and structure of can to determine evolutionary relationships between species.
a. chromosomes
c. communities
b. populations
d. adenosines

The right answer for blank is-

a. chromosomes.

Explanation:

Chromosomes are the thread like structures, composed of DNA (deoxyribonucleic acid) and possess unit of heredity on them, known as genes ( a segment of DNA that codes for a particular protein).

Genes are transferred from parents to the next generation and thus the genetic information (in the form of sequence of DNA) is transferred from parents to their offspring.

Organisms belonging to same species have same number and structure of chromosomes (such as human beings have 23 pairs of chromosomes with similar structures in all).

Thus, the number and structure of chromosomes helps to determine evolutionary relationships between species.

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.

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