Let "r" stand for the recessive red hair trait. A person with red hair must have a genotype of "rr" ( one from each parent) in order to have red hair( red hair being the phenotype).
Let "B" stand for brown hair and "b" stand for not brown hair. A person with brown hair can have a genotype of "Bb" or "BB" and have a phenotype of Brown hair. This is becasue brown hair "B" is the dominant trait.
D. An encyclopedia. Encyclopedias are trusted and have reliable information. I feel like this shouldn't be posted in biology though
Answer:
Aves is a class of vertebrates that comprises the birds' species.
1. Archiornithes
2. Neornithes
The answer is D. Sedimentary rock takes millions of years to form since sedimentary rock is formed by sand cementing together over long periods of time.
