<span> A solid, steady energy level is very important for the brain. The brain uses almost one-third of our calories. Any fluctuations or low levels of energy will have enormous impacts on our nervous system and emotions as well. </span>
<span> This has been demonstrated and is well-known in the case of hypoglycemia. In this condition, the brain does not receive a steady supply of glucose. Common symptoms can mimic many emotional and physical disorders. These include fatigue, depression, anxiety, confusion and even violence and psychosis.</span>
<span> Emotionally speaking, when one is tired, decision-making and all other mental and emotional factors are more difficult. Thousands of people today suffer from low energy levels. This often results in feelings of depression, anxiety, mood swings, irritability, withdrawal and more.</span>
Mutations are the source of all new alleles. An allele is a variant form of a gene. Variations in alleles lead to variations in organisms. Positive mutations give an organism a better chance of survival. It means that the mutation may be passed on to the offspring. Negative mutations may lead to an early death.<span> Therefore, changes in alleles from one generation to another form the basis of evolution.</span>
Answer: option A - includes all of the ecosystem services, future uses, and non-use values (such as cultural, intrinsic, and aesthetic values) of an ecosystem.
Explanation:
Ecosystem is the interrelationship of organisms (plants, animals, microbes) with each other and their environment.
The TOTAL economic value of an ecosystem includes:
the presently utilized resources,
the resources to be derived in the future,
the non-use or intangible aspects (like tourism, beautification, etc)
Genetics was the key information that was not known during Darwin’s time.