Gene (C) controls fur pigmentation in Himalayan rabbits. Although the two rabbits in the picture have the same genotype, the rabbit reared at temperatures above 30°C has no black fur pigmentation on its ears, nose, and feet.

The gene C is inactive at these higher temperatures. The gene fails to express the particular phenotype specified by the gene. In this case, temperature is an environmental influence that affects gene expression.

Explanation: I just did it and got them correct.

Choana, paired fins with a fleshy base over a bony skeleton, persisting notochord, 2 dorsal fins and nares.

Explanation:

Sarcopterygii also known as lobe-finned fishes which usually possess a choana, paired fins with a fleshy base over a bony skeleton, persisting notochord, 2 dorsal fins and nares are present internally. The lungfishes are considered the closest living relatives of tetrapods because of the presence of some common features. The African lungfish has epithelial crypts located at the base of the lamellae of the olfactory epithelium that express markers of the vomeronasal receptors in tetrapods.