Describe the various structures on the aboral “spiny skin” of a sea star and discuss their functions.
What will be an ideal response?
Pedicellaria: the valves of these pincher-like structures grasp objects that land on the surface of the body, such as potential parasites. Skin gills: the thin surface of these soft, hollow, conical structures allows for the exchange of gases and waste ammonia between the sea water and coelomic fluid.
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In many marine systems, the carbon and oxygen cycles are directly proportional to each other
Indicate whether the statement is true or false.
How did Thomas Malthus influence Darwin's thinking?
a. Darwin was convinced artificial selection could work in nature. b. Darwin realized species typically produce more offspring than needed to replace the parent generation. c. Darwin realized that the fate of humanity was dependent on artificial selection. d. Darwin believed the fate of humanity was dependent on natural selection. e. Darwin was convinced to publish his ideas about natural selection
Aposematic coloring occurs when ____
a. coloration serves as a disguise b. a harmless species resembles a repellant one c. two or more repellant species resemble one another d. an individual can increase its size when threatened e. repellant species exhibit bright, contrasting patterns
It is important for cattle to add proteins to their body, so which plant would be best for them to eat?
A) barley B) corn C) oats D) alfalfa