Alguien para que haga ese trabajo porfa vor

The cluster of developing cells from conception until birth is called an

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Rarefaction is used for which of the following? a. creating a representative sample b. studying how disease impacts populations c. rediscovering species thought to be instinct d. determining which sea creatures live in an area