Even after the angiosperms became the dominant
plants on Earth, the conifers retained a competitive
edge
a. at high elevations in the far north.
b. in temperate northeastern coastal regions.
c. in mid-continent plains.
d. in southern woodlands.
e. in northwestern scrub forests.
Answer: a
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Which of the following statements is true regarding the lowest level of a trophic pyramid (that is, the pyramid base)?
A. It contains the greatest amount of energy. B. It contains the greatest amount of carbon. C. It has the largest biomass of all the trophic levels. D. It is often comprised of phytoplankton (if in aquatic environments). E. All of these statements about the lowest level of a trophic pyramid are true.
Polyploid plants are often unhealthy as compared to other plants
Indicate whether the statement is true or false.
Is there a relationship between the problems encountered cloning mammals and the rarity of polyploidy in this group?
What will be an ideal response?
All of the microtubules are the same length, and homologous chromosomes are aligned midway between the spindle poles at ____.
A. telophase I B. metaphase I C. anaphase I D. metaphase II E. anaphase II