The central column of conductive tissue in the root system is known as a(n) ________
a. vascular cylinder
b. endodermis
c. epidermis
d. root cortex
e. pericycle
a
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In the traditional phylogeny (A), the phylum Platyhelminthes is depicted as a sister taxon to the rest of the protostome phyla and as having diverged earlier from the lineage that led to the rest of the protostomes
In the molecular phylogeny (B), Platyhelminthes is depicted as a lophotrochozoan phylum. What probably led to this change? A) Platyhelminthes ceased to be recognized as true protostomes. B) The removal of the acoel flatworms (Acoela) from the Platyhelminthes allowed the remaining flatworms to be a monophyletic clade clearly tied to the Lophotrochozoa. C) All Platyhelminthes must have a well-developed lophophore as their feeding apparatus. D) Platyhelminthes' close genetic ties to the arthropods became clear as their Hox gene sequences were studied.
Mamadou has started to experience severe pain due to kidney stones, which he has developed for the first time in his life. A bone scan shows that his bones are losing calcium at an alarming rate and becoming weakened
Based on the information in this chapter, predict what his physician is most likely to look for.
What does it mean to say that experimental conditions are controlled?
a. The test groups consist of the same individuals. b. The null hypothesis is correct. c. There is no difference in outcome between the control and experimental treatment. d. All physical conditions except for one are identical for all groups tested.
Some of the largest leaves in the world can be found on plants near the forest floor of dense tropical rain forests. Which of the following precursors for photosynthesis is most likely limited in these large leaves?
A) oxygen B) carbon dioxide C) glucose D) light