Photoautotrophs chemoautotrophs cyanobacteria were the first organisms that released oxygen as a by-product of photosynthesis user: gymnosperms and angiosperms that were more adapted to land were seed-bearing and able to reproduce using
pollen
cones
flowers
seeds user: scientists believe cyanobacteria chemoautotrophs photoautotrophs were the first types of cells able to make their own food.

Photoautotrophs were the first organisms that released oxygen as a by-product of photosynthesis

Gymnosperms and angiosperms that were more adapted to land were seed-bearing and able to reproduce using seeds.
Scientists believe cyanobacteria were the first types of cells able to make their own food.

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.