The flying squirrel of North America very closely resembles the sugar glider of Australia. They are both similar in size, have long, bushy tails, and skin folds that allow them to glide through the air. From an evolutionary standpoint, however, they did not come from a common ancestor. The squirrel is a placental mammal while the sugar glider is a marsupial (very different embryonic development). These close similar adaptations, even though genetically and geographically separated by great distances, can best be explained by

A. Convergent Evolution
B. Spontaneous Generation
C. Divergent Evolution
D. Vestigial Structures

Each trait of a plant is determined a. an allele b. one gene c. a pair of genes d. one dominant gene

Match the order of the levels of organization in nature with the correct description. example: atoms are fundamental units of matter= level 1levels- 2,3,4,5,6,7,8.now what levels are these? population consists of organismscells consist of moleculesecosystems consist of communities interacting with there environmentmolecules consist of atomsthe biosphere consist of all ecosystems on earthcommunities consists of populationorganisms consist of cells

On a backpacking trip, kenny hikes all day at a steady pace, covering 30 kilometers and burning 4000 calories. at the school track, janelle runs the 100-meter sprint in 13.5 seconds, burning 10 calories. afterward, janelle’s leg muscles are aching and she is breathing hard, while kenny maintains normal breathing all day, even though he burns 400 times more calories than janelle. which two statements offer the best explanation for this phenomenon? a. if the aerobic pathway—cellular respiration—cannot meet the energy demand, then the anaerobic pathway—lactic acid fermentation—starts up, resulting in lactic acid buildup and "oxygen debt." b. aerobic cellular respiration produces more energy, but its use is limited because of lactic acid buildup in the muscles and the resulting "oxygen debt." c. after about 90 seconds of intense exercise, the muscles become depleted of oxygen, and anaerobic respiration can no longer function to produce atp, resulting in "oxygen debt." d. the rate of energy demand determines how the muscles will obtain energy, either from cellular respiration or from lactic acid fermentation if not enough oxygen is present.