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Which of the following describes an example of possible sympatric speciation:

The theory of endosymbiosis:

A planula, polyp, and medusa are three different life stages in what type of organism:

Wild cherry (Prunus avium) is a tree that has been widely cultivated by humans for its fruit, which is also attractive to birds. Based on this information, wild cherry is most closely related to which of the following plants?

The fused clavicle bones of birds which most people know by the term ‘wishbone’ is termed a:

Select all of the following that have flagellated sperm:

Chelonians have a dorsal and a ventral bony shell called (respectively) the: [A] (dorsal) and the [B] (ventral).

According to the diagram which bear species is most closely related to the ancestor of all bears?

A sorus is

Which of the following are NOT a characteristic of ferns (select all that apply)?