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8 Jan 2018

Name and describe three types of coloration that animals use to prevent predation

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Jean Keeling
Jean KeelingLv2
9 Jan 2018
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Related questions

There is a population of speckled rattlesnakes living in the desert of Arizona. Individuals in this population can range from a dark brown coloration to a speckled white coloration. There are also two types of rock formations in this area: one with high quartz content (white) and table mesa sedimentary rocks (brown). Because of these two types of prominent rock outcroppings, only rattlesnakes at either end of the coloration spectrum are able to sufficiently camouflage themselves to avoid predation. Because of these, individuals with intermediate coloration are unlikely to survive and reproduce. This is an example of:

-Disruptive Selection

-No Natural selection

-Directional selection

-stabilizing selection

John Endler studied color patterns in guppies that are found in streams in the tropical forests of Venezuela. He noticed that males and females were sexually dimorphic, with males displaying numerous bright spots and other colorations, while females were typically drab in color. However, in natural populations there is considerable variation in the brightness of male coloration, with males in some populations being very bright and males in other populations being less brightly colored. Endler did a series of experimental studies in natural and artificial environments, where he varied predation pressure by either introducing, or excluding guppy predators. He found that male guppies from high predation environments became less brightly colored over the course of several generations, while males in low predation environments became more brightly colored. Please explain these results.

1. A) Comparing digestion between sponges and cnidarians, what are the benefits of developing extracellular digestion in a gastrovascular cavity for the evolution of larger animals? B) A) Explain how bilateral symmetry contributed to motion, predation, cephalization (the evolution of a head and brain) and increased the diversity of animals.

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