A. oxygen atom
H2 O1
There are 2 hydrogen atoms and 1 oxygen atom
The answer is endocrine system. It is a collection of glands producing hormones that woulf regulate tissue function, growth development and regulate metabolism. The hormones would then be carried out to the circulatory system.Hope this answer would be of help.
Answer:
Genetics- this is the scientific study of genes and heredity.
Breeding- The production of offspring by animals.
Explanation:
Cellular respiration is when cells take oxygen and food to make energy, and also water and carbon dioxide. For the organism to get oxygen, they breath in the air from the outside. The oxygen travels through the respiratory pathway to get to cells.