Which of the following infectious diseases are a challenge to form a vaccine for due to their constant mutations (choose all that apply) •polio
•HIV
•influenza
•measles

The shift of a vehicle's weight around its center of gravity is known as

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.

Drag the tiles to the correct boxes to complete the pairs. match the nitrogenous base of dna with its complement.