Age of onset for schizophrenia is
A) prenatal.
B) birth.
C) early childhood.
D) early adulthood.
D) early adulthood.
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Lignified, tube-like structures that branch throughout the body of some plants, conducting water and solutes, are called
____.
a. vascular tissues b. apical meristems c. root systems d. rhizomes e. shoot systems
Suppose we are proving the statement that if two integers are even, then their sum is even. We execute the proof by first showing that if integer A and B are even, then they can be defined as A = 2k and B = 2m. We then note that their sum must be A + B = 2(k + m), which must be even. This is an example of what type of proof?
A. Direct proof B. Proof by transposition C. Inductive reasoning D. Proof by induction
On the basis of this figure, multicellularity in plants and opisthokonts:
a. has the same evolutionary origin. b. is independently derived in each lineage. c. is fixed within the each lineage (all organisms are multicellular). d. originated in the amoebozoa.
Scientists believe that the heart of the common (chordate) ancestor of all vertebrates
A. consisted of a single ventricle. B. had three chambers. C. had two chambers. D. had four chambers. E. was little more than a heavily-muscled region of the ventral artery.