Please help explain the model from these 3 things

1_ atmosphere co2 concentration have increased over time.

2_the pattern is most likely DIRECTLY due to the process of fossil fuel combustion.

3_ the pattern is most likely indirectly due to the process of Diffusion into the atmosphere.

please explain these 3 things and explain the directly VS indirectly.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

this is a good question! i'll do some research and come back when i have the answer!

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.