Many seedless plants produce spores of one morphological type, which is referred to as:
a. heterospory.
b. sporogeny.
c. megaspory.
d. homospory.
e. microspory
D
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Numerous hypotheses have been proposed for the mass extinction of about 60% of all species, including nearly all the dinosaurs, about 65 million years ago. Evidence has been found of the impact of a large meteor at about the time of this mass extinction. The amount of dust and debris put into the atmosphere upon impact, as well as atmospheric heating, would have been enormous. Using your knowledge of photosynthesis, speculate about why the dinosaurs subsequently became extinct.
What will be an ideal response?
Chlorofluorocarbons (CFCs) are one of the main gasses that contribute to the destruction of the ozone layer. Which of the following is not a source of CFCs?
a. Plastic foam b. Coolants in appliances c. Aerosol cans d. Solvents e. Exhaust from automobiles
When pH levels in the blood get too low, chemical buffers are released that return blood pH back to normal levels
This is an example of ___.
a. negative feedback b. positive feedback c. ectothermal reactions d. sensory perception e. endothermal reactions
The Na+/K+-ATPase pump is a ligand-gated ion channel.
Answer the following statement true (T) or false (F)