Suppose that there are 500 units of energy available at the producer level of the energy pyramid. Approximately how many units of energy are available to the first level consumer?

How long ago did homo sapiens aprears

Which vitamin a compounds act like hormones, regulating cell differentiation, growth, and embryonic development?

What are the two part of a solution

The male red-winged blackbird defends its territory and uses loud vocalizations to attract a mate. Such behavior directly benefits these birds because it results in (1) increased competition for food (2) greater reproductive success (3) reduced

Which is the first type of cell to differentiate? A. neuron B. epithelial cell C. muscle cell D. blood cell

Why aren't there any cures for genetic disorders

Carbohydrates are composed of which three elements

4. What is a physical or mental representation of an object or an arent? a theor a hypothesis a model a scientific lair

The Hematodinium parasite becomes less of a problem for the blue crab when A-the crab is very young B-fishing is thriving in the region. C-the crab moves to less salty water. D-a significant percentage of the population is impacted.

Homeostasis is classified under which of the following A. Cell respiration B. Transcription C. Cell regulation D. Photosynthesis