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In Cnidaria, the nervious system is called a nerve _______________.

Nematodes have a tube-within-a -tube body plan .

A species that has separate male & female sexes is referred to as

Roundworms have incomplete digestive systems.

A Planaria is a member of which phylum?

The hard substance deposited by the coral animals is ______________.

What is the term that refers to animals that have no true internal body cavity?

Which of these statements is the best explanation of what happens in the photoelectric effect experiment?

In an experiment done in the early 1900’s, Rutherford used a radioactive source to bombard a thin sheet of gold foil with a narrow beam of alpha particles. He carefully measured where these alpha particles went after they hit the foil. Thomson’s plum pudding model was the model of the atom being used at the time. Which of the following explains what Rutherford expected to happen based on Thomson’s model, and why he expected these results?

When a very large number of electrons are sent through the slits, which of these statements best depicts what is observed?