How do you know if a new species has been created

Select the correct answer. which term do biologists use to describe the average number of individuals of a species per unit area? a. carrying capacity b. population density c. minimal viable population d. survivability curve

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

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