To which skeletal system does the sternum belong? spongy skeleton compact skeleton axial skeleton appendicular skeleton

The correct answer is option D

The vertical, central axis of the human body is formed by the axial skeleton. It consists of 80 bones which include a skull, neck, chest, and back. It includes 22 bones of the skull, 6 bones of middle ears, 1 hyoid bone, 26 bones in the vertebral column, and 1 sternum, and 12 pairs or 24 ribs.  

Together with the appendicular skeleton (126 bones), it forms the complete skeleton.

Explanation:

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.