Describe at least 3 adaptations of modern whales adapted for a completely aquatic existence
What will be an ideal response?
First and foremost is the overall shape of the cetacean body. It is shaped like that of a fish, which implies that this shape is ideally suited for aquatic habitats. The nostrils of whales, which are called blow holes, occupy the dorsal surface of the animals, making it much easier to breathe without having to lift the head completely out of the water. Whales are also covered by a thick layer of blubber in order to minimize heat loss and maximize buoyancy in cold waters. The ears of whales are blocked by wax to minimize possible damage from the marine environment and to eliminate any compressible air passages. These ears are also internal, which could eliminate possible drag effects. Finally, the whale circulatory system is designed to minimize heat loss by incorporating a heat exchange mechanism in the appendages.
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The biome most known for its rich, deep topsoil is:
a. tundra b. taiga c. tropical rain forest d. desert e. grassland
In the U.S., __________ is the main reason why more than 700 species are listed as threatened and
endangered.
What will be an ideal response?Fluid entering which nephron portion is more dilute than normal body fluids?
a. Bowman’s capsule b. proximal tubule c. descending limb of loop of Henle d. ascending limb of loop of Henle e. collecting ducts
Which of the following are incorrectly paired?
a. pancreas?glucagon b. hypothalamus?oxytocin c. pineal gland?melatonin d. adrenal cortex?glucocorticoids e. thyroid gland?thyroxine