CK12 Life Science

beauty of this group resides in that design. Later in this lesson, learn how symmetry takes advantage of the animal’s habitat. F ...

Figure 12.12: An echinoderm, the keyhole sand dollar. ( 18 ) Theseandotheradaptationswillbeexploredinmoredetailasweexaminethismo ...

Figure 12.13: An echinoderm, the giant California sea cucumber. ( 9 ) digestive system, often leading directly from mouth to anu ...

Figure 12.14: This passion flower feather star is an echinoderm. ( 36 ) Thefollowingtablesummarizesthefourmainclassesofechinoder ...

dollar and sea cucumber burrowing provides more oxygen at greater depths of the sea floor, thus allowing a more complex ecologic ...

The larvae of many echinoderms, especially starfish and sea urchins, arepelagic(of or pertaining to the open ocean). How does t ...

12.3 Lesson 12.3: Arthropods Lesson Objectives Explain what arthropods are. Describe the features of crustaceans. Describe the ...

Figure 12.16: A species of spider in its web. ( 7 ) Figure 12.17: A species of scorpion. ( 4 ) ...

Figure 12.18: A centipede, from the subphyla of myriapods. ( 34 ) Figure 12.19: A species of millipede found in Hawaii. ( 1 ) ...

Figure 12.20: The blue American lobster illustrates the segmented body plan of the arthro- pods. ( 22 ) Figure 12.21: Giant spid ...

Figure 12.22: The sessile barnacles shown here feeding. ( 32 ) Figure 12.23: A crayfish. ( 27 ) ...

this covering in a process calledmolting. It is the largest phylum in the Animal Kingdom with more than a million described spec ...

Figure 12.24: A terrestrial arthropod, a species of woodlice. ( 20 ) eggs. Others, such as woodlice, lay their eggs on land, alt ...

Arachnids Arachnids are a class of joint-legged invertebrates in the subphylumChelicerata. They are mainly terrestrial, but are ...

Figure 12.26: Various diseases are caused by species of bacteria that are spread to humans by “hard” ticks, like the one shown h ...

The arachnids are divided into eleven subgroups.Table(12.4) shows the four most familiar subgroups, with a description of each. ...

Table 12.4: (continued) Subgroup of Arach- nid Representative Or- ganisms Approximate Num- ber of Species Description Opiliones ...

Table 12.4: (continued) Subgroup of Arach- nid Representative Or- ganisms Approximate Num- ber of Species Description Scorpiones ...

Table 12.4: (continued) Subgroup of Arach- nid Representative Or- ganisms Approximate Num- ber of Species Description Acarina Mi ...

Some mites prey on undesirable arthropods and are used in pest control, while others control weed growth. Populations of whip sc ...