Which of the following statements is true?

the equator is warmer than the poles because the sun's energy is spread over a larger area.
the top layer of rock in a sedimentary bed is older than the bottom layer.
fossilization depends on slow burial and exposure to large amounts of oxygen.
global winds are caused by warm air rising near the equator and cold air sinking near the poles.

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.

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus