Although identical twins inherit exact copies of the same genes, the twins may look and act differently from each other because?

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

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems

Which organism in this food web is an omnivore?coati