Answer:
B. Brain and spinal cord
Explanation:
because we need both in order to survive and work properly.
Answer:
Hey
Plant cells are different than animal cells because they work differently in other words they need things the other cell doesn't need. For example, we need oxygen so we have blood cells, but plants don't need oxygen so they don't.
I hope it helped
<u><em>Wbob1314</em></u>
Answer:
Explanation: The cells are produced by preexisting cells that undergo mitosis and pass through the cell cycle.
Answer:
Explanation:
Gene expression is the process by which the instructions in our DNA are converted into a functional product, such as a protein. It acts as both an on/off switch to control when proteins are made and also a volume control that increases or decreases the amount of proteins made.
Answer:
B) Alzheimer's disease.
Explanation:
Alzheimer's disease is a neurodegenerative disorder that causes the degeneration and death of brain cells. It is progressive, meaning it occurs gradually over an extended period of time.
Alzheimer's disease occurs when neurons in the brain fail to produce enough neurotransmitters such as acetylcholine which are required for normal communication between neurons in the brain. Acetylcholine plays a vital role in memory retention and recall. Insufficient neurotransmitters causes neurons to begin to die off. This process is known as neurodegeneration.
Neurodegeneration occurs as a result of sticky proteinous lumps that forms hardened layers on the cells in the brain. These abnormal proteins are called beta-amyloid proteins. Also, there are numerous fibres which entangle the nerve cells and are called neurofibrillary tangles.
Alzheimer's disease leads to a gradual decline in thinking, social and behavioural skills and ultimately memory loss and debilitation.
