While walking in a forest, you find a plant with what appears to be unfertilized seeds located at the bases of woody scales exposed to the air. Yellow dust-like particles coat the surface of the unfertilized seeds. This plant is probably a(n)
A) gymnosperm.
B) bryophyte.
C) angiosperm.
D) alga.
E) seedless vascular plant.
A
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Which of the following statements is false?
a. Individuals are injected with antibodies to produce passive immunity. b. A genetically engineered virus is not as potentially dangerous as a weakened but intact pathogen. c. Allergies occur when the body makes a strong immune response to a normally harmless substance. d. Allergies are a nuisance but are never dangerous or life threatening. e. An allergic response includes the secretion of mucus, prostaglandins, and histamines.
What is likely to be the greatest challenge facing the zoned reserve systems of Costa Rica?
A) high predation by jaguars B) the impossibility of ecotourism C) decreasing soil erosion D) a growing human population
Which clinical feature in a newborn baby girl suggests the possibility of Turner syndrome?
A. Absence of Babinski reflex B. Presence of a webbed neck C. Presence of epicanthal folds D. Absence of irises of both eyes
Within a chromosomal sequence of a dog, a researcher identifies a block of base pairs with very similar GC content. This observation is likely the result of:
a. horizontal gene transfer. b. replication errors. c. centromeres. d. gene duplication. e. This is unknown.