Common ancestry isn't the only reason for similarities between species. Similar traits can also arise if species experience similar selective forces and adapt to them in similar ways. This process is known as:

This process is known as: convergent evolution

Explanation:

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Linear

Step-by-step explanation:

If you graph this, you start at 1500 on the y-axis. Every time the x-axis increases by 1, the y-axis increases by 200. This forms a straight line, making it exponential since it increases by a constat amount.