Which of the following sounds has the highest pitch?

500 Hz

1,000 Hz

2,000 Hz

Sketch and label a food-web that includes at least 6 different items. Make sure to have the arrows show how energy flows from one trophic level to the next.

How are populations related to communities?

Do organisms work together to form another level of organization

Lisa suffers from kidney stones. One small stone manages to get lodged in the ascending limb of the nephron loop of one of her nephrons. Predict what would happen to the amount of filtrate produced over time by this particular nephron.

Genetic drift is a change in the gene pool due to chance. Genetic drift increases as the population decreases. What accounts for this relationship?

An ocean trench forms when?

The fact that a strain of yeast with a certain defective gene can use the human version of the gene to repair itself is evidence that yeast and humans

What is the difference between a meteor and a meteorite? A meteor has more mass A meteorite reaches Earth and has not burned up A meteorite orbits the sun and a meteor does not A meteorite glows

Which of these was NOT characteristic of the first cells on Earth? A) anaerobic B) prokaryotic C) single-celled D) contained organelles

Which process occurs only in autotrophic organisms?