Answer:
Indicator species
Explanation:
Indicator species refers to the species whose presence or absence in particular ecosystem indicates about the condition of the ecosystem.
In the given question, the stonefly which cannot survive if the dissolved oxygen in the water gets reduced as a result of the pollution indicates that the ecosystem or habitat has some pollutants which have decreased the level of DO in the aquatic habitat.
Thus, the indicator species is the correct answer.
Answer:
The correct option is this: CARDIAC MUSCLE DOES NOT USE THE SLIDING FILAMENT MECHANISM FOR CONTRACTION, SKELETAL MUSCLE DOES.
Explanation:
The muscles found in the heart are called cardiac muscles while the ones found in the skeleton are called skeletal muscles. Both muscles have some differences and similarities. One similarity between the two is that both of them are striated muscles. Also, both cardiac and skeletal muscles use the sliding filament mechanism for contraction.
The differences include the following:
1. Skeletal muscles are involved in voluntary movement while cardiac muscles engage in involuntary movement.
2. Cardiac muscles can not survive for long in the absence of oxygen while skeletal muscle can adapt to absence of oxygen.
3. Cardiac muscles cell have more mitochondria compare to skeletal muscles cells.
Answer:
One sample should have had no enzyme and acted as a control.
The answer is b hfhrhrhfhgfjfjfjfhff
