(Q).
Q: What type of feeders are sea lilies and feather stars? Read this paragraph and choose the correct option from the provided answers: Explore the sea star's body plan (http://openstaxcollege. org/l/sea_star) up close, watch one move across the sea floor, and see it devour a mussel. Brittle stars belong to the class Ophiuroidea. Unlike sea stars, which have plump arms, brittle stars have long, thin arms that are sharply demarcated from the central disk. Brittle stars move by lashing out their arms or wrapping them around objects and pulling themselves forward. Sea urchins and sand dollars are examples of Echinoidea. These echinoderms do not have arms, but are hemispherical or flattened with five rows of tube feet that help them in slow movement; tube feet are extruded through pores of a continuous internal shell called a test. Sea lilies and feather stars are examples of Crinoidea. Both of these species are suspension feeders. Sea cucumbers of class Holothuroidea are extended in the oral-aboral axis and have five rows of tube feet. These are the only echinoderms that demonstrate "functional" bilateral symmetry as adults, because the uniquely extended oral-aboral axis compels the animal to lie horizontally rather than stand vertically. Choices: - deposit feeder - bottom feeder - silt feeders - suspension feeders A:
(A).
suspension feeders

(Q).
Q: Serious imbalances, cancer and other diseases can result when expression of what goes awry? Read this paragraph and choose the correct option from the provided answers: Choices: - proteins - ribosomes - gametes - genes A:
(A).
genes

(Q).
Q: The cochlea is a shell-like structure that is full of fluid and lined with nerve cells called what? Read this paragraph and choose the correct option from the provided answers: The stirrup passes the amplified sound waves to the inner ear through the oval window (see Figure above ). When the oval window vibrates, it causes the cochlea to vibrate as well. The cochlea is a shell-like structure that is full of fluid and lined with nerve cells called hair cells. Each hair cell has tiny hair-like projections, as you can see in Figure below . When the cochlea vibrates, it causes waves in the fluid inside. The waves bend the "hairs" on the hair cells, and this triggers electrical impulses. The electrical impulses travel to the brain through nerves. Only after the nerve impulses reach the brain do we hear the sound. Choices: - sperm cells - red cells - brain cells - hair cells A:
(A).
hair cells