Larval development is common among marine crustaceans but very rare among freshwater ones. Can you hypothesize why?

Describe possible ancestors to sponges. Justify your answer.

earthworms and leeches belong to which phylum?

Imagine you come across a gelatinous animal with a Medusa body plan. Determine whether it is a class Hydrozoan or a Cubozoan? Give two distinct differences between the two without naming the same structure/invisible features of each animal (e.g animal x has 2 wings, animal y has 4 wings are not distinct differences)

Which of the following groups of early-diverging animals is comprised of two layers of cells that float around in the ocean?   a. Cnidaria   b. The sponges   c. Ctenophores   d. Placozoa

Why do some biologists think that the apicomplexans descended from dinoflagellates?

Can you answer all the parts to this question regarding sharks  A: The reproductive organs on a shark are called claspers.  But do they actually clasp the other shark?   B: Why are there two claspers?

compare and contrast sponges and eumetazoans. Hire are they alike and how are they different

The term Ecdysozoa refers to....? Group of answer choices having a backbone having jointed legs filter-feeding molting

The first fossils were of 1. amoeba 2. trilobites 3. yeast 4. stromatolites