What is the relationship between cell and substrate concentration?

The substrate uptake rate depends not only on its concentration but also on other environmental factors (temperature, toxicity, pH, etc.) and on the state of cells, what particular transporters are expressed and take part in nutrients consumption.

the answer is d. chordata

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.