For an offspring to dominate a recessive trait, both parents must have at least one dominant allele in their genotype.
It's C, enzymes accelerate chemical reactions.
The turtle's heart consists of three chambers, their atrium are completely divided while their ventricles are incompletely divided. The structure of the turtle's circulatory system allows the complete separation of oxygenated and deoxygenated blood. This makes the blood circulation of the turtle flexible.
Cardinal
Phylum: Chordate
Class: Aves
Order: Muscicapoidea
Family: Cardinalidae
Genus: Cardinalis
Species: Cardinalis cardinalis