How would Darwin explain the change the length of the giraffes neck ?

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.

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

Study this image which statement best describes the rock shown check all that apply