Suppose scientists discover a new echinoderm that uses its tube feet to move across the deep-sea floor as it hunts for prey. This newly discovered echinoderm can most likely be classified as a(n):

Echinoderms are defined as various invertebrate marine animals characterized by a hard, spiny covering or skin. They have attracted much attention due to their extensive fossil record, ecological importance, and unusual body forms. Although most echinoderms are extinct, many living representatives still exist. All living echinoderms have an internal skeleton and a central body cavity, but their outward appearance can vary significantly. For example, starfish and brittle stars have arms that extend from a central disk; sea lilies have a central stalk, or stem, and resemble flowers; and sea cucumbers are wormlike and tend to burrow. The ways in which echinoderms move and feed are as diverse as their body forms. Table 1 lists certain echinoderms and their methods of locomotion (movement) and feeding. Table 2 includes examples of echinoderm habitats around the world. According to Table 1 and Table 2, crinoids can be found feeding on plankton.

Predation is an interaction between individuals of 2 species in which one is harmed (the prey), and the other is helped (the predator). Predation can occur among plants and animals as well as between plants and animals. Some biologists contend that herbivores, or plant eaters, are predators. Table 1 indicates some characteristics and examples of certain predators. Based on Figure 1, during which year were the greatest number of prey animals available?

Predation is an interaction between individuals of 2 species in which one is harmed (the prey), and the other is helped (the predator). Predation can occur among plants and animals as well as between plants and animals. Some biologists contend that herbivores, or plant eaters, are predators. Table 1 indicates some characteristics and examples of certain predators. Studies have shown that a certain species of deer will only eat a specific type of plant found in the deer's nat- ural habitat, and nothing else. Is this finding supported by the information in the passage?

The instrument shown is used to study:

When the thermometer was in the 40°C water, in the time interval between 0 sec and 2 sec, approximately how rapidly, in °C/sec, was the temperature registered by the thermometer changing?

The three basic crystal structures are called Hexagonal Close Packed (HCP), Face Centered Cubic (FCC) and Body Centered Cubic (BCC).Shown below are alternative representations of the structures in Figure 1.The order in which they are represented is: