Arboviruses are transmitted by the (contact/enteric/vector) route
What will be an ideal response?
vector
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What is the number of chromosomes found in
an oak tree?
a. 2 b. 4 c. 8 d. 12 e. 24
The tectorial and basilar membranes are
located within a. A. b. B. c. C. d. E. e. another unlabeled region of this figure
During the Pleistocene era, many large mammal species went extinct. Their permanent disappearance occurred in a short period of time when humans were expanding across North America. In this situation, how do many scientists view humans?
A) as a threatened species B) as a density-independent factor C) as an invasive species D) as a biological control agent
Except near hydrothermal vents, the communities of the oceanic aphotic zone get their energy mainly from
A) photosynthesis by local phytoplankton. B) photosynthesis by local zooplankton. C) oxidation of sulfur by sulfur bacteria. D) organic matter sinking from the photic zone.