The pressure-flow hypothesis describes
A. how carbohydrates enter the sieve tubes.
B. how hormones move through the phloem.
C. how carbohydrates in solution move through the phloem.
D. how carbohydrates and minerals move through the xylem.
E. how water and minerals move through the xylem.
Answer: C
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A chimpanzee's closest extant relative is a(n)
A. orangutan. B. mandrill. C. South American spider monkey. D. human.
The most powerful way to infer evolutionary relationships relies on which type of evidence?
A) Comparison of DNA base sequences B) Comparative anatomy C) Behavioral similarities D) The ability to mate and produce fertile offspring
Succession happens because species in the habitat alter that habitat in ways that assist other species. There are three dynamic concepts that are of critical importance for succession to take place. They are
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How is summation related to IPSPs and EPSPs? What is the difference between temporal summation
and spatial summation? What will be an ideal response?