3. Which of the following statements is true about the worm phyla? Annelida and Nematoda phyla are the simplest of all worms while Platyhelminthes are complex worms

most annelids are free-living animals, but most flatworms and roundworms are parasites

Annelida, Platyhelminthes, and Nematoda all have animals with a coelom

many annelids are parasites, but flatworms and roundworms help fertilize the soil

Which of the following would be a body response when stepping outside without a coat on a snowy day? a. senaceous glands. secrete more senum b. more liquid is transported by the body to the skin fir insulation c. blood vessels in the skin narrow and contract d. blood vessels in the skin expand

Which group of algae is characterized by unicellular organisms and includes some members that would be better classified as zooflagellates? euglenophytes red algae sporozoans green algae

Scientists are conducting a study on the effectiveness of a new drug on memory loss. they are giving some of the test subjects the new drug to find out if it improves their long-term memory. which are possible limitations of this study? check all that apply. a) test subjects may want to participate in additional experiments. b) test subjects may think they should be paid more. c) test subjects may get bored and want to quit early. d) test subjects may have to travel during the experiment. e) test subjects may have full-time jobs. this is multiple choice. you for the !