Stem cells are what allow planaria to grow and regenerate as the stem cells can change into any of the cells that make up the planaria.
Answer:
B., D., A., A., C., D., D., A., D., C.
Explanation:
The epidermis is the 5 top layers, and the dermis is the 2 inner layers
Answer: 10. A. capital. 9. B. 8. C.
Explanation:
<span>Amylase needs an optimum pH for its activity. It is in the range of 6-7. Below or above pH will denature this enzyme. The pH level is optimum for this enzyme in the mouth and hence it catalyses the break down of sugar. The pH level of stomach is lower than its optimum level duet to the activity of gastric acid. Hence the enzyme becomes inactive in the stomach.</span>
