Which organisms are most closely related? a. aix sponsa and anas acuta b. anas discors and anas americana c. anas cyanoptera and mycteria americana d. martes americana and mycteria americana

B. Anas discors and Anas americana  

They are more closely related because they are in the same genus group, anas.

B. Anas discors and Anas americana

Explanation:

Genus is a group of species that have some common morphological features but cannot interbreed. Anas discors and Anas americana belong to same genus "Anas" and are most closely related than other pairs which belong to different genus. Anas discors and Anas americana represent two species of genus "Anas".

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a- multicellular

b-eukaryotic

c-no cell wall

d-heterotrophic

e-autotrophic