Using materials of your choice, develop a mathematical model of energy flow through four trophic levels in an ecosystem. To start, decide what will represent one energy unit. Then, decide what will represent the trophic levels.

answer; i believe the correct answer is (anemia);

compost can be added to topsoil as a:

pesticide

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: