<span>A
trophic level pertains to the position of an organism in the food chain. Humans
are the mos dominant organism that belong
to more than one trophic level. When we eat plants we become the primary consumers
but when we eat meat we can become the secondary or the tertiary consumers.
Birds are also organisms that belong to more than one trophic level. When birds
eat seeds they become the primary consumer, but when they eat insects they
become the secondary or even the tertiary consumers. </span>
Plants produce oxygen, energy (glucose).
Pectinate muscles are parallel ridges in the walls of the atria of the heart. The name is due to their resemblance to the teeth of a comb (pecten). The heart is the organ pumps blood to all parts of the body. It is made up of four chambers, that is, right and left ventricles, left and right atria, and the blood vessels, Pulmonary artery, pulmonary vein, aorta, and venacava. An auricles are pouch like structure that increase the total filling capacity of the atrium and also increase the volume of blood that an atrium is able to contain.
Answer: I believe the correct answer is A
Explanation:
