4. A grouping based on the ability of members to
successfully produce offspring with one another is:
a. Kingdom
b. Class
c. Family
d. Species

What is thought to have caused the mass extinction at the end of the cretaceous period?

Aheterozygous normal male marries a woman with a sickle cell anemia. give the genotypes and possible phenotypes of the offspring

The earth's oceans are made up of chlorine, and trace elements. a) carbon, oxygen b) oxygen, silicon c) hydrogen, oxygen d) nitrogen, oxygen