The alula is a small structure that is found on birds. It is located at the joint between the hand wing and the arm wings of birds and it is the freely moving, first digit of a bird's wing. It is normally used by birds in slow flight. In humans, the structure that is comparable to the alula is the thumb.
A type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell, as in the production of gametes and plant spores. Compare with mitosis.
Answer:
The leaves of plants contain openings called stomata, which are used for the exchange of gases. Carbon dioxide, combined with water in photosynthesis, is drawn in through the stomata. Oxygen, a byproduct of the process, is released through these openings, along with water vapor in a process called transpiration.
Explanation:
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