Algae in an aquatic food chain convert solar energy into 93,000 kilocalories of plant tissue. which of the following values best represents the amount of energy available for secondary consumers in the food chain

Only 3% of the water on earth is usable by humans. even though that 3% is through the water cycle, we still need to be careful not to waste water.

The inverse square law applies to: intensity of sound gravitational force intensity of light electric force magnetic force

Which of these best describes the term ecliptic? a. the circle where "earth meets the sky" b. the change in azimuth and altitude of an object c. the point directly above the geographic north pole d. the path of the sun through the constellations of the zodiac