Answer:
Hilum.
Explanation:
Hilum may be defined as the type of the depression or the fissure and may present in kidney known as kidney hilum, present on spleen and the lungs. This is also known as hilus.
The hilum marks the entry and exit of the nerves and the blood vessels. The lung hilum is a triangular like depression through which the blood vessels, capillaries and the nerves enter and leave in the lungs and connects the other organ of the body.
Thus, the correct answer is option (d).
Oxygen, liquid water, and life is on planet earth
A Dew forms on grass when water vapor forms when molecules cool and join together.
B Gases expand when heated and contract when cooled.
The Krebs cycle. The steps are
1. Glycolysis
2. Krebs Cycle
3. Electron transport chain.
The Calvin cycle is in photosynthesis.
adaption - adaption - adaption - adaption - adaption