In a typical food chain what percentage of energy is passed on to the next trophic level

What claim did thorne make? what evidence supported his claim?

Many farmers prefer cattle without horns because it is safer for their herds. the allele for no horns (n) is dominant to the allele for the presence of horns (n). a farmer mates a male with horns to a heterozygous female without horns. what is the chance that the offspring will have horns?

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms