An atom with a mass number of 234 and an atomic number of 90 has?
a. 90 neutrons and 144 protons
b. 234 neutrons and 90 protons
c. 144 neutrons and 90 protons
d. 117 neutrons and 117 protons

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.

b. the carbon cycle ensures living things have a source of hydrogen