There is a group of invertebrate animals called rotifers, among which a particular group of species reproduces, as far as is known, only asexually. These rotifers, however, have survived a long evolutionary history without evidence of having been overcome by excessive mutations. Because the rotifers develop from eggs, but asexually, what can you predict?

A) The eggs and the zygotes are all haploid.

B) The animals are all hermaphrodites.

C) While asexual, both males and females are found in nature.

D) All males can produce eggs.

E) No males can be found.

Answer is E. No males can be found.

Explanation:

The rotifers are invertebrate aquatic multicellular organisms. They are freshwater aquatic organisms with the possession of circles of strong cilia, which they use for locomotion, and thus the name wheel-bearer.

The Rotifers are grouped into three classes, which are Seisonidae, Monogononta and Bdelloidae.

The way of reproduction in these classes differ. The Seisonidae reproduce sexually, Monogononta reproduce sexually or asexually, and the Bdelloidae reproduce asexually.

The Bdelloidae reproduce asexually because they did not have males. They female produced the offspring from an unfertilized eggs. This process is known as pathenogenesis.

In this case, the Bdelloidae is the class that reproduce mainly by asexual reproduction because no male can be found.