How is movement in vertebrates analogous to the movement of a lever?
What will be an ideal response?
The bones connected by movable joints work like levers. Levers are ridged and move around a pivot
point known as a fulcrum. Levers, like joints, differ with respect to where the fulcrum is along the
lever and where the force is applied. Whether muscles produce large movements at high speed is
dependent on where the fulcrum is relative to where the force is applied.
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The first law of thermodynamics is also known as the law of ________
A. conservation of energy B. conservation of mass C. conservation of entropy D. lost energy E. increased entropy
Osmosis is a(n) ____________________ process because it does not require ATP energy. Fill in the blank(s) with the appropriate word(s)
According to the redundancy hypothesis, species are redundant if
A. they have an effect on the ecosystem that is disproportionate with their abundance. B. they could be eliminated or replaced by others with no loss of ecosystem function. C. their ecological niche overlaps somewhat with another species. D. they have grown beyond their carrying capacity for a particular ecosystem.
Which elements are required by all cells in the largest amounts?
a. nitrogen, sulfur, iron, and phosphorus b. phosphorus, oxygen, sulfur, and carbon c. carbon, oxygen, hydrogen, and nitrogen d. magnesium, hydrogen, nitrogen, and, iron