In seed plants, an immature male gametophyte is also known as a
A. pollen grain.
B. seed.
C. cone.
D. sperm.
Answer: A
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According to the text, technological and industrial innovations now make the urbanization process reversible
Indicate whether this statement is true or false.
Why are the climate forecasts of GCMs not to be fully trusted?
A) The physics involved are still not fully understood. B) Underlying assumptions influence the outcome and may not be totally accurate. C) They are still not capable of simulating anything but air temperature. D) Researchers often tweak the outcome to match political agendas.
Which of the following is the hallmark of a saturated hydrocarbon?
A. a hydrocarbon where carbon has only a single bond to two or more other carbons B. any molecule that is completely dissolved in a hydrocarbon solvent C. a hydrocarbon that is completely dissolved in water D. a hydrocarbon where carbon has multiple bonds to one or more other carbons E. none of the above
Any animal that eats other animals, living or dead, as a source of nutrients is a(n) ____
a. ectotherm b. endotherm c. suspension feeder d. carnivore-scavenger e. herbivore