Lance armstrong just finished third (by about 5 minutes) in the 2009 tour de france cycling race. this was an incredible feat for the 37-year-old father of 4. first and second-place winners, alberto contador (age 27) and andy schleck (age 24), respectively, have no children. which of these three men shows the greatest evolutionary fitness?

Freckles are a dominant trait in humans. both of the girls have the genotype ff for freckles. if either one marries a man with no freckles, what are the chances that their children will have freckles?

In 2015, about ten percent of total u.s. energy consumption was from renewable energy sources. renewable energy plays an important role in reducing greenhouse gas emissions. when renewable energy sources are used, the demand for fossil fuels is reduced. sanjay and his family want to cut back on their use of non-renewable resources at home. they are thinking of an alternate way to heat their home without adding more greenhouse gases or pollutants to the environment. which renewable resource would not fit into their plan? a) solar power b) burning wood c) constructing a wind turbine eliminate d) generating hydroelectric power

Substances that can pass through cell membranes by diffusion include a. na ions. b. proteins c. glucose. d. oxygen.