Which soil type is the most prone to leaching?
a. gravel or sand
b. silt
c. clay
d. humus
e. none of these
Answer: a
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The last common ancestor of gymnosperms and angiosperms possessed which of the following characteristics? Select all correct choices
A. pollen B. flowers C. seeds D. vascular tissues E. double fertilization
Which animal group does not have tissues?
a. nematodes b. sponges c. echinoderms d. flatworms e. cnidarians
Sickle-cell anemia is caused by a recessive mutation in the hemoglobin gene. However, heterozygote individuals also show a small percentage of sickled red blood cells. What type of inheritance pattern is this an example of?
A) Polygenic inheritance B) Sex linked C) Chromosomal nondisjunction D) Incomplete dominance
The activation of the parasympathetic branch of the autonomic nervous system is associated with _____
A) resting and digesting B) release of epinephrine into the blood C) increased metabolic rate D) intensive aerobic exercise