Which of the following characteristics are shared by members of Class Trematoda? Select all that apply
> No digestive system
> Intermediate and definitive hosts
> Flukes
> Mostly free-living
> Flat
> Intermediate and definitive hosts
> Flukes
> Flat
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Which of the following is a function of plastids?
a. storing starches, proteins, and pigments b. protecting the cell membrane from damage c. modifying the DNA structure of an organelle d. gathering energy from organic molecules
Foraging bees communicate with other bees in a waggle dance to give information about the food. The important cue in the dance that conveys information about the required flight direction to the food source relative to the hive-sun direction is the
A. angle between the food source and the hive in reference to the sun. B. angle between the waggle run and the vertical axis within the hive. C. angle between the waggle run in reference to the hive-sun angle. D. angle between the waggle run in reference to the direction north from the hive. E. speed of the waggle dance.
Egg-laying mammals
a. hatch fully developed young from their eggs. b. are monotremes. c. are hairless. d. are confined to South America. e. bear their young into permanent pouches.
Which gland is the remnant of the "third eye"?
a. pineal b. pituitary c. thyroid d. parathyroid e. thymus