Match the following mechanisms (Column I) with their correct example (Column II).

Column I	Column II
A. Heat-generating and heat-retaining mechanisms	i. increased metabolic rate (thyroid hormones, sympathetic nervous system)
B. Heat-dissipating mechanisms	ii. vasodilation of blood vessels of the skin (decreased sympathetic tone)
	iii. increased activity of sympathetic cholinergic fibers to sweat glands.
	iv. shivering
	v. vasoconstriction of blood vessels of the skin (increased sympathetic tone)

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#Question id: 12131

#Unit 10. Ecological Principles

Use the following diagram of a hypothetical food web to answer the following questions. The arrows represent the transfer of food energy between the various trophic levels.

Which letter represents an organism that could be a producer?

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#Question id: 5533

#Unit 5. Developmental Biology

Cleavage is considered as

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#Question id: 10471

#Unit 6. System Physiology – Plant

Under temperate conditions, which one of the two major factors that are involved with light-dependent stomatal opening are,

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#Question id: 1360

#Unit 4. Cell Communication and Cell Signaling

Plasmodesmata of plant cells have .........in common with gap junctions in animal cells, but have .......... that gap junctions lack.

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#Question id: 13221

#Unit 6. System Physiology – Plant

There are two main types of water-transporting cells in the Xylem,