Answer the following question given this paragraph: Most tunicates live a sessile existence in shallow ocean waters and are suspension feeders. The primary foods of tunicates are plankton and detritus. Seawater enters the tunicate's body through its incurrent siphon. Suspended material is filtered out of this water by a mucus net (pharyngeal slits) and is passed into the intestine through the action of cilia. The anus empties into the excurrent siphon, which expels wastes and water. Lancelets possess a notochord, dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail in the adult stage (Figure 15.35). The notochord extends into the head, which gives the subphylum its name (Cephalochordata). Extinct fossils of this subphylum date to the middle of the Cambrian period (540488 mya). The living forms, the lancelets, are named for their blade-like shape. Lancelets are only a few centimeters long and are usually found buried in sand at the bottom of warm temperate and tropical seas. Like tunicates, they are suspension feeders. Q: Most tunicates live a sessile existence in shallow ocean waters and are suspension feeders. the primary foods of tunicates are plankton and this? Choices: - bacteria - crustaceans - debris - detritus A:
detritus

Answer the following question given this paragraph: Animals such as bats and dolphins send out ultrasound waves and use their echoes, or reflected waves, to identify the locations of objects they cannot see. This is called echolocation. Animals use echolocation to find prey and avoid running into objects in the dark. You can see in the Figure below and also at the following URL how a bat uses echolocation to find insect prey. http://www. bsos. umd. edu/psyc/batlab/headaimmovies/nsf_challenge/nsf4. wmv. Q: What is the term for the method of sending out ultrasound waves to determine the locations of objects? Choices: - catabolism - magnetism - morphology - echolocation A:
echolocation

Answer the following question given this paragraph: An element is the basic chemical building block of matter; it is the simplest chemical substance. Q: What is the basic chemical building block of matter; it is the simplest chemical substance? Choices: - atoms - helium - hydrogen - element A:
element

Answer the following question given this paragraph: Pea plants reproduce sexually. The male gametes are released by tiny grains of pollen. The female gametes lie deep within the flowers. Fertilization occurs when pollen from one flower reaches the female gametes in the same or a different flower. This is called pollination . Mendel was able to control which plants pollinated each other. He transferred pollen by hand from flower to flower. Q: Fertilization occurs when what material from one flower reaches the female gametes in the same or a different flower? Choices: - ova - nitrogen - sperm - pollen A:
pollen