The accumulation of several mutations in the main gene on the virus's surface may be able to give H7N9 the ability to spread like human flu viruses do, passing from person to person through coughing and sneezing.
Answer:
with traits best suited to their current environment
Explanation:
Natural selection proposes that nature selects those organisms that are well adapted to the prevailing environmental conditions to survive and reach reproductive maturity with the favourable characteristics being passed on to the offspring. Those organisms that are poorly adapted die leaving no offspring and their traits are eventually eliminated.
Answer:
chick
Explanation:
it has feathers and lays eggs
Genetic variation can be caused by mutation ( which can create entirely new alleles in a population), random mating, random fertilization, and recombination between <span>homologous chromosomes during meiosis ( which reshuffles alleles whitin an organism's offspring). </span>
Hi!
The answer is Precambrian.
Hope this helps!
-Payshence xoxo
