Eutely is an interesting phenomenon found in certain Aschelminths. In such animals number of cells may be constant in all members of a species. Sometimes number of cells may be constant in an organ. For example 959 somatic cells are present in adult Caenorhabditis elegans , in it's pharynx 80 cells are present.
In most animals it takes place in the female gonads, the ovaries.
reproduction
It takes place in the mitochondria in both plants, animals and microogranisms.
To exchange gases such as co2 and o2
Oogenesis takes place in the female gonads of most animals. The eggs are created through oogenesis in the ovaries of women.
Respiration means the action of breathing. It takes place no differently in farm animals as in other mammals - using internal lungs.
A Mitochndrion are the powers of the cell, where respiration takes place.
A horse can be donated to any place that takes rescue animals. Not typical rescue animals, though. Horses are not considered regular animals, like dogs.
It's not so much a state, as a state of mind. Most people who do abusing animals are pretty messed up in the head, and so it takes place in their deluded hallucinations. However, sometimes it's their job, so it takes place in their trying to feed their family.
In most species - mating usually takes place in spring-time.
Considering that cellular respiration takes place in humans, which are a "higher" form of animals, you can assume that cellular respiration can also take place in all other animals. Without cellular respiration, the animals would have no form of cellular energy, ATP, and would start to die off.
That tradition takes place on October 4, the Feast of St. Francis of Assisi.