The energy available at the trophic level that forms the base of an energy pyramid is 5,000 kilocalories. how much energy is available at the trophic level that has secondary consumers? a. 500 kilocalories b. 50 kilocalories c. 5 kilocalories d. 0 kilocalories

What pattern of migration do whales follow?

Aparent with freckles is crossed with a parent without freckles. the punnett square shows the possible genotypes and phenotypes of the offspring. which statement accurately describes the probability of phenotypes? a. the offspring are more likely to have freckles. b. the offspring are more likely to have no freckles. c. the likelihood of the offspring having freckles and not having freckles is the same. d. the likelihood of the offspring having freckles and not having freckles cannot be determined.

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of