<span>The unifying principles of virology are: All viruses are made of a nucleic acid molecule in a protein coat, all viruses are incapable of replicating themselves and must infect a host cell to do so, and all viruses must have genomes that provide mechanisms for them to work.</span>
Answer:
a mature haploid male or female germ cell which is able to unite with another of the opposite sex in sexual reproduction to form a zygote.
Explanation:
Answer:
13,15
Explanation:
the sequence is adding by (+2)
A.the evolution of mammals
When the dinosaurs became extinct the existing mammals no longer had to fight for food.