Which is an example of primary succession?

An oak growing in abandoned field

Ferns growing in the forest

A new cactus growing next to an old cactus

Lichens growing on a cooled level rock

An oak growing in an abandoned field.

Explanation:

This is the correct answer because primary succession is when plants and animals are the first to colonize in a lifeless habitat, and an abandoned field is a lifeless habitat since its been abandoned.

complete the square on the right side of the equation;

-5(x + 0)^2 + 15

answer: d. y = -x^2 + 15

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