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Asexual and sexual reproduction in animals is similar in that both a. increase genetic variation in offspring. b. produce offspring that have double the amount of genetic information of the parent(s). c. rely on parental chromosomes to mix in new ways. d. generate offspring that carry parental genes.

By the end of a normal first trimester, the zygote has a. not yet developed visible limbs. b. developed recognizable arms and legs. c. reached its birth length. d. gained about 50 percent of its birth weight.

In the absence of ________, nutrient recycling within the ecosystem would completely stop. a. rocks c. decomposers b. secondary consumers d. predators    

A decline in phytoplankton could affect the climate of Earth by altering the ________ cycle by moving less ________ from the atmosphere into phytoplankton tissues. Since ________ is a greenhouse gas, more of it in the atmosphere could contribute to global warming. a. carbon; carbon dioxide; carbon dioxide b. phosphorous; phosphorous; phosphorous c. hydrologic; water; water d. oxygen; oxygen; oxygen

At each trophic level, a portion of the energy originally captured by producers is lost as metabolic heat,  typically released as a by-product of cellular respiration.

A fast-moving flow consisting of a mixture of water and volcaniclastic debris is termed a ________.

A fast-moving flow consisting of a mixture of water and volcaniclastic debris is termed a ________.

If an igneous dike cuts across a sequence of sedimentary beds, ________.

Slow and steady movement on a fault that does not generate earthquakes is termed ________.

Iceland rises above the Atlantic Ocean as a result of ________.