The role of a sphincter is to
a. control the passage of materials.
b. create a churning motion.
c. propagate peristalsis.
d. absorb excess water from feces.
e. do more than one of these
A
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Which portion of the photosynthetic apparatus absorbs light?
A. photosystem I B. photosystem II C. NADP reductase D. both photosystem I and photosystem II E. both photosystem I and NADP reductase
Four of the five characteristics listed below are
advantages to having an extensive membrane system. Select the exception. a. a platform for metabolic activities b. a simplified cellular organization c. an increased surface area for reactions d. a variety of organelles e. an increased surface to volume ratio
If forests are cut down, semiarid deserts could result.
Answer the following statement true (T) or false (F)
Which animals are ectothermic?
A) frogs and mammals B) lizards and birds C) turtles and lizards D) birds and mammals