Can someone give me the answer, so confused.

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the forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

there are 14 dogs at the park now

you should add the points so we know what to choose from.   but to figure out the answer, graph it.   then any points the are on the line are solutions.