The fertilized egg enters a 2-week period of cell division. During this period, the fertilized egg is known as a(n) embryo ovary placenta sperm zygote

Acladogram is a branching diagram that represents suggested evolutionary relationships among organisms based on the presence of unique traits. a scientist discovers a new organism that lacks limbs and does not have a true backbone. the organism lays eggs to produce offspring and has a cartilage-like rod known as a notochord running along its dorsal surface. on the cladogram below, select the species to which the newly discovered organism is most closely related.

Environmental impacts on evolution : mastery test

What is any method of measuring the age of an object or event in years, such as using atomic half-life?