How is the immune system related to the skeletal system (bones)?

How does the molecular clock work? a. it analyzes the brain functionality of two different species.b. it examines and compares the physical characteristics of two different species.c. it illustrates relationships between two different species.d. it compares the number of mutations that exist in the dna of two different species.

What are the pros and cons of transect sampling?

When rutherford performed his metal foil experiment, he was surprised that most of the alpha particles