<span>There are three layers of meninges the dura mater, the arachoid mater, and the pia mater. The dura mater was the thick, opaque layer that had to be pulled back before dissecting. The pia mater is the thin, vascular layer that adheres to the surface of the brain. Weren't able to see the arachoid mater because of its transparency.</span>
In the presence of lactose, the gene for beta-galactosidase is turned on by induction. The RNA polymerase binds to the promoter, in the presence of lactose. Lactose binds to repressor leading to structural changes so that it does not bind to the promoter. This leads to the production of beta-galactosidase which breaks the bond between glucose and galactose, for utilization of lactose.
Answer:
provides your brain with a constant supply of oxygen rich blood
ok, with what I don't see anything upload please
In animals, gas exchange follows the same general pattern as in plants. Oxygen and carbon dioxide move by diffusion across moist membranes. In simple animals, the exchange occurs directly with the environment. But with complex animals, such as mammals, the exchange occurs between the environment and the blood.