What are the four major components of the earth's crust?

What does all of the organ system in a human form

Use this new information to determine the parents’ genotypes (indicated by red arrows). then calculate the probabilities that the second male offspring will have each condition. drag one pink label to each pink target and one blue label to each blue target. then use the white labels to answer questions 1 and 2. labels can be used once, more than once, or not at all.

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