Why are fossils from older species found deeper in the earth than those from more recent species?
A) Layers of sediments accumulate every year, covering older fossils in more layers.
B) Older species were more likely to burrow underground.
C) Modern species can swim better than older species.
D) Older species were more likely to be trapped in sediments and form fossils than modern species.
A
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Which of the following generally causes stomata to open?
a. release of abscisic acid by the roots b. a drop in CO2 concentration in leaf air spaces c. exposure to red light d. a drop in O2 concentration in leaf air spaces e. an increase in CO2 concentration in the leaf air spaces
Which of these characteristics is NOT found in the amphibians?
A. two-chambered heart B. small inefficient lungs C. thin moist skin D. eggs with gelatinous covering E. aquatic larvae
________ are of the same type since they are derived from the same B cell and are against a specific antigen.
A. Agglutination factors B. Allergen antibodies C. Immunosuppressant agents D. Monoclonal antibodies E. Autoimmune agents
If an organism was discovered that had no epithelial tissues, it would require adaptations to maintain homeostasis in which of the following areas? The organism would require adaptations _____
A) in its skeleton for structure B) in its nervous system for sensing external stimuli C) that would prevent water loss from the body in a terrestrial environment D) in its muscular system for movement