q:
a:
according to the dichotomous key, in what way(s) is the house sparrow similar to the cobra?
a) both are autotrophic and live on land.
b) both are not a mammal and are autotrophic.
c) both live on the land, are unicellular, and are not trees.
d) both are not a mammal, are multicellular, and are heterotrophic

D: Both are not a mammal, are multicellular, and are heterotrophic

the answer is d  the sparrow is a bird and the cobra is a snake.  They both lay eggs.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg