The size of a food chain can vary, but the number of levels that a food chain can reach is limited. Why does this limit exist?

Plants are not infinite in number.
Producers are limited by consumers.
Carnivores are too large to be eaten.
Energy is lost at each trophic level.

i think its through the fallopian tube

the answer to your question is tooth decay.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

the principle of segregation describes how pairs of gene variants are separated into reproductive cells. from his data, mendel formulated the principle of segregation. we now know that the segregation of genes occurs during meiosis in eukaryotes, which is a process that produces reproductive cells called gametes.