Explain the ecological significance of limiting resources, using three specific examples in your discussion. What will be an ideal response?
A limiting resource is an environmental resource that is scarce or unfavorable to the species,
and therefore limits the ecological niche of that species. Three limiting resources are the
soil’s mineral content, temperature extremes and precipitation amounts.
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In the 1950s, Earl Sutherland and colleagues discovered that epinephrine ____
a. triggers the release of a second messenger which leads to the hydrolysis of glycogen to glucose b. triggers the release of a second messenger which lowers blood glucose by causing it to bind to liver cells c. interacts directly with the enzyme glycogen phosphorylase d. interacts directly with the cell membrane to help transport glucose into the cell e. is a signaling molecule that does not require a cell surface receptor
The macroalgae are commonly known as:
a. seagrasses. b. seaweeds. c. kelps. d. higher plants. e. phytoplankton.
The number of circuits in the circulatory systems of humans is
a. one. b. two. c. three. d. four.
In mammals, the presence of four limbs is ________, and hair is ________
A) a shared derived character; a shared ancestral character that places mammals in the tetrapod clade B) a shared ancestral character; a shared derived character unique to mammals C) a homologous feature; an analogous feature D) monophyletic; parsimonious