Which of the following characteristics are expected in the first animals to have colonized land?
1. were probably herbivores (ate photosynthesizers)
2. had four appendages
3. had the ability to resist dehydration
4. had lobe-finned fishes as ancestors
5. were invertebrates
A) 3 only
B) 3 and 5
C) 1, 3, and 5
D) 1, 2, 3, and 4
C
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A pair of shared valence electrons is referred to as a(n):
A. ionic bond. B. hydrogen bond. C. van der Waals interaction. D. covalent bond. E. hydrophobic effect.
Which of the following flaviviruses can be prevented by vaccination?
A) yellow fever B) dengue fever C) hantavirus D) Ebola
The type of immunity that results from the the production of antibodies by an individual following an infection or vaccination is ______ immunity.
Fill in the blank(s) with the appropriate word(s)
Compared to conventional agriculture, organic farming
A) uses fewer synthetic pesticides. B) increases crop yields. C) guarantees the safety and extra health benefits of food. D) requires much less hands-on work.