Which type of change is necessitated unexpected environmental events or pressures?

Reactive changes are the type of changes that are necessitated unexpected environmental events or pressures. Organiyations or businesses make such reactive changes in their practices after some threat or opportunity has already occurred.

Other types of changes are anticipatory changes, that are the oppsite because they are planned changes.

Clam get 5000 Kcal by eating the plankton

Explanation:

Explanation:

In any food chain the amount of energy that is transferred to the successive trophic level is  ten percent of the energy available at the previous trophic level.

Here, manta ray gets 50 kcal of energy by eating the  starfish

The amount of energy contained in star fish is equal to

\begin{gathered}0.1 * X = 50 \\X = 500\end{gathered}0.1∗X=50X=500 Kcal

Now Starfish gets its energy from clam.

Therefore total energy in clam is equal to

\begin{gathered}0.1 * X = 500\\X = 5000\end{gathered}0.1∗X=500X=5000

Therefore, clam get 5000 Kcal by