All changes Position B: Once the food has been broken down, it moves down the esophagus using gravity and smooth muscle tissue. It ends up trapped inside the stomach by a sphincter muscle. 2. Is this a mechanical digestion? Chemical digestion? Both?

Number and variety of living organism; includes genetic, species, and ecological types

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?

Aprimary producer stores 9,000 kcal. in the energy pyramid, if a primary producer is consumed by a first-level consumer, and that first-level consumer is consumed by a second-level consumer and the second-level consumer is consumed by a third-level consumer, how much energy is stored by the third-level consumer from the primary producer? *