Small intestine
They enter the Krebs Cycle.
Energy can enter the earth system from internal sources through convection and from external sources through radiation from the Sun (solar energy).
the Krebs cycle
They can. In cellular respiration proteins may be broken down and modified to enter as part of the citric acid (Krebs) cycle.
how does energy enter this living world
yes
The producers energy enter the ecosystem by the heat of the sun.
nutrient are broken down before entering the cell.small parts of nutrients are taken inside a cell be diffusion and passive transport. there is no energy usage this kind of transport. but there are some big molecules that can not enter cell membrane. so there are taken by active transport.(there is a energy usage in active transport).
bile
These are the components of the mixture.
they enter the bloodstream. when you get cut for example, the capillaries are broken, so there, the pathogens enter.
as sunlight..