What are enzymes and how are digestive enzymes used in your digestive system? Options;
a) They are lipids that help make fats to then pass on to other cells that need them.
b) They are proteins that would break down the food into smaller pieces.
c) They are lipids that help make membranes to move food into and out of the cell.
d) They are proteins used to make more proteins for the digestive system.

B. Proteins are present in the Stomach acid that help break down food/drink for our digestive system to get nutrients.

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:

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.