Answer:
A heart attack occurs when the flow of blood that carries oxygen to the heart is blocked. The myocardium is deprived of oxygen and begins to die.
A person who has a heart attack may have some of these symptoms, or all of them:
Uncomfortable pressure, inflammation or oppressive pain in the center of the chest
Discomfort or pain that spreads beyond the chest to the shoulders, back, neck, jaw, teeth, one or both arms, and sometimes the upper abdomen
Shortness of breath
Stun, dizziness and fainting
Sweating
Sickness
Usually, a heart attack causes chest pain for more than 15 minutes, but it also may not show any symptoms. It is important to know that other symptoms may occur in addition to chest pain, such as indigestion or persistent pain in the neck or jaw.
Many people who have a heart attack have warning signs in advance of hours, days or weeks.
Answer;
Yes. The benefit of a mutation can help it survive in a particular environment.
Explanation;
-Mutations are changes in the genetic code of an organism. There are different types if mutations, and they typically occur when DNA is being replicated and something goes wrong during the replication process, causing a base pair or set of base pairs to be changed somewhere in the DNA strand.
-Though mutations can be harmful, mutations can also be beneficial. In fact, beneficial mutations are the basis for evolution. When a mutation occurs that makes an organism better suited for its environment, then the organism is better able to survive and reproduce and the mutation can be passed along to the organism's offspring. This type of actively beneficial mutation is rare, but it does occur.
Answer:
Autotrophs
Explination: They are called this because they use the energy and simple inorganic compounds to produce organic molecules.
