1. The first four-legged animals to reach land were classified as
2. Pangaea was fully formed during the late Period.
Respond to the following based on your reading.
W
3. Briefly explain the causes of glaciation and the processes that cause glaciers to grow.
4. Briefly explain how changes in sea level and evidence of past marine life are related
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1. amphibians

2. Carboniferous

3. For glaciation to begin, something needs to cause Earth's temperatures to drop. If this happens, snow that falls on the polar ice caps doesn't melt, and glaciers grow. As snow and ice reflect sunlight, the Earth's temperature is reduced even further, causing glaciers to continue growing.

4. Sea level changes cause marine transgressions and regressions. During a marine transgression, the shoreline moves inland, leaving sedimentary deposits that contain fossils. The shoreline retreats during a marine regression, leaving behind the deposited sediments

Explanation:

 subscript 3 mean 3 oxygen atoms

Explanation:  NaHCO3 is an ionic compound which when dissolved in water gets dissociated into its constituent ions that are Na+ and HCO3- .

Thus the subscript 3 explains the number of oxygen that are attached to the carbon in the hydrogen carbonate ion.

The structure of the following is given below -