URGENT Which of the following best explains why there are seldom more than five trophic levels in a food chain? O The ecosystem contains too much biomass living mass)

O Most carnivores function at more than one trophic level
Top cami vores are too few in number to prey effectively

O Energy is lost from each trophic level

How are gene and protein sequences used to classify organisms?

Hemoglobin is the compound in red blood cells that carries oxygen to the body. the distribution of hemoglobin in women in g/dl of blood is approximately normally distributed with mean 14 and standard deviation 1. too little hemoglobin, and you're anemic. 2. too much, and (unless you live at high altitudes), you can have other problems.

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.