Assume there are 1000 units of energy in the producer level of the energy pyramid. How many units of energy are available at each of the three consumer levels? Show your calculations.

A large population of three-spined stickleback fish lives in an Alaskan lake. Two alleles segregate at a neutral locus. The allele frequency of the first allele is 0.78. What is the most likely frequency of that allele in the next generation?

Which statement describes the role of xylem in vascular plants? A) It transports food in the plant in one direction. B) It transports water in the plant in one direction. C) It transports food in the plant in both directions.

Radiation requires a heated liquid to transfer energy. true or false?

The proteins embedded in a membrane require that region of the protein to be

Why do we get itch's

Describe how a scientist using the phenic system would classify an organism.

A student made a model of an ecosystem inside a sealed plastic bottle. She placed soil, rocks, water, plants, and animals inside the bottle. How is the model different from a natural ecosystem? A. The model lacks producers. B.

The scientific name of an organism is formed from what two parts of the organism's classification?

If the women does not get pregnant, then the corpus breaks down and the level of progesterone stars declining. Once progesterone decreases what happens to the lining of the uterus?

The three stages in the development of a full tropical cyclone are formative, mature, and A. dissipation. B. damage. C. tornado. D. tropical cyclone.