What base does A always match with in DNA; and what base does B always match with?

well A matches with T, and C matches with G, there is no B

Explanation:

remember this:

-the Apple doesn't fall far from the Tree

-the Car goes into the Garage

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.

50% lit on the left side