Answer:
2 and 4
Explanation:
Those eat things to become secondary
 
        
             
        
        
        
The gene responsible for producing amyloid precursor protein (app) appears to explain the development of Alzheimer disease. 
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- A form of dementia that progresses is Alzheimer's disease. A condition that adversely impacts memory, thinking, and behavior is referred to as dementia. The modifications make daily life more difficult.  There are numerous possible causes of dementia, including diseases and brain traumas.  Sometimes there is no known cause. The condition is typically diagnosed in patients over the age of 65. 
- Alzheimer's disease is typically described as having an "early onset" or "younger onset" if it is discovered earlier. Alzheimer's has no known cure, but there are medications that can halt the disease's growth. Alzheimer's disease is a brain ailment that gradually impairs thinking and memory abilities as well as the capacity to do even the most basic tasks.  Additionally, psychological and behavioral changes are common in people with Alzheimer's.
Learn more about Alzheimer disease here:
brainly.com/question/14952284
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Answer:
Red Blood Cell lacks a nucleus, it would be unable to carry oxygen efficiently.
Explanation:
The absence of a nucleus is an adaptation of the red blood cell for its role. This allows the red blood cell to contain more hemoglobin and, therefore, carry more oxygen molecules. It also allows the cell to have its own distinctive bivalve shape, which promotes diffusion.
 
        
             
        
        
        
 It helps us to use other resources such as Fossil Fuels to get energy. To get energy from them you have to burn them, which releases Carbon Dioxide when burned, which is bad for the atmosphere; CO2 (carbon dioxide) in the air is the main reasoned for global warming