Meninges and cerebrospinal fluid both protect the brain from physical shock.
Meninges is one of the membranes that engulf the brain .
Cerebrospinal fluid is the fluid that the brain floats in and absorbs shocks. #answerwithquality #BAL
Answer:
The time required for the colony to grow two million bacteria is 29.22.
Explanation:
Time required for the colony to grow can be calculated by the following equation:

Here t is time, N = 2 million (require bacteria population).

t ≈ 29.22
Time taken by bacteria to grow is 29.22.
They provide the immune system with "memory" against previously encountered pathogens.
T memory cells are necessary for protective immunity against invading pathogens
The answer is D hope it helps
Answer:
For 4.) The lighter outer part of a shadow is called the penumbra. Hope this helps ^_^