According to charles darwin what is one reason that not all organisms survive in nature?
a. some organisms are born not knowing how to survive.
b. there are more organisms born than resources can support.
c. the parents do not care well for the offspring.
d. most organisms are born with mutations that kill them.

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.