Red blood cells are able to maintain homeostasis because they are bathed in blood, which is isotonic <span>to the fluid in the cells themselves.
</span>A solution is said to be isotonic when its effective osmole<span> concentration is the same as that of another solution.</span>
These are all true except <span>"D. Natural selection usually causes a species to change suddenly," which is false. Natural selection and the subsequent changes to a species takes many thousands of years to have observable results. </span>
Answer:
1. B
2. A
Explanation:
According to this question, a student is trying to decide which kind of bottle to purchase, however, he is considering the kind that will have lesser negative impact on the environment and society. The plastic bottle is easy to use due to their convenience and light-weight but they are DISPOSABLE. On the other hand, metal bottles are reusable and keeps water longer.
In accordance to the student's heart for the sustainability of the environment, he should choose the METAL BOTTLE because the metal bottle is RECYCLABLE i.e. can be reused. Recycling of most materials has been encouraged in order to curb the spread of non-biodegradable materials like plastic that can serve as pollutants to the environment.
