Water of course, sunlight and plants.
climate
The kinetic energy of the molecules is the source.
Oxygen is the final electron acceptor in the electron transfer chain and therefore needs to be present in the Kreb's cycle. Without oxygen only anaerobic repiration will occur.
Both the citric acid cycle and the Calvin cycle are metabolic pathways found in living organisms. They both involve a series of chemical reactions that help in the production of energy or organic compounds. While the citric acid cycle occurs in the mitochondria and is involved in cellular respiration, the Calvin cycle takes place in the chloroplasts and is involved in photosynthesis.
TCA cycle occur in the mitochondria (the power house of the cell)
It cannot occur in the dark. It contains an enzyme called rubisco which is a light-activated enzyme. Also the Calvin cycle uses the chemical energy produced in the light reactions, and the light reactions need sunlight energy in order to produce the energy needed in the Calvin cycle. Hope that helps :)
The Krebs cycle takes place in the matrix of the mitochondria.
The sun provides most of the energy for the water cycle to occur.
The gases needed for respiration, namely oxygen and carbon dioxide, are exchanged between organisms in the respiratory cycle. This cycle involves inhalation, where oxygen is taken in from the environment, and exhalation, where carbon dioxide is released back into the environment. These exchanges occur in various organisms, including humans and animals, to support their metabolic processes.
The energy in the water cycle primarily comes from the sun. Solar radiation heats the Earth's surface, causing water to evaporate from oceans, lakes, and rivers. This evaporation process provides the energy needed for the water cycle to occur.
The Calvin cycle is called the dark cycle because it does not require light to proceed. Unlike light reactions, the Calvin cycle is a light-independent reaction, which means it can and will occur in the dark as well as the light.
Throughout the menstrual cycle, two key processes occur: the ovarian cycle and the uterine cycle. The ovarian cycle involves the maturation of follicles and the release of an egg during ovulation, while the uterine cycle prepares the endometrium for potential implantation of a fertilized egg. If fertilization does not occur, the uterine lining is shed during menstruation, marking the start of a new cycle. These processes are regulated by hormonal changes that occur throughout the cycle.