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Which of the following is not a general characteristic of Mammalia?

Sea stars contain a __________, which they evert outside their body to begin digesting food externally.

This part of the mollusk is adapted for locomotion, attachment and capturing food:

Class that is often viewed as a transitional group of animals since they start out as aquatic larva and change into terrestrial adults:

Most primitive of man’s direct ancestors, they stood about 3 feet tall, had a cranial size of about 400-550 cc’s, and date back to 2.8 million years is:

Snakes use their tongue to collect airborne molecules and then transfer them to their __________, which Is their olfactory organ.

These are paddle-like structures attached to the segments of a marine-dwelling segmented worm:

The phylum associated with ferns is:

These openings in a grasshopper’s exoskeleton allow for gas to enter and exit the body:

In which of the following situations would it be appropriate to use the tt-distribution for testing instead of the zz-distribution? Select all that apply.