13) Ecologists study how relationships between biotic and abiotic factors impact the many levels of organization on earth. What level of organization is defined as groups of different species that live together in a single ecosystem?
A) organisms
B) ecosystems
populations
D) communities

4the indian leaf butterfly has traits that allow it to resemble a leaf. the bright colors of the monarch butterfly indicate that the butterfly tastes bad and can be poisonous. how does the appearance of these butterflies them to survive? f the indian leaf butterfly is able to avoid predators while the monarch butterfly warns predators away. g. the indian leaf butterfly frightens predators away while the monarch butterfly poisons predators before they can eat it. h both butterflies rely on camouflage to avoid predation. j both butterflies cooperate with one another to avoid predation.

The first amino acid of a new polypeptide chain is

This is a biological reaction due to a stimulus. i need this quickly !