Name the two principles in which food preservation methods are based.

1.inactivating enzyme

2.removal of microorganisms or inactivating them

Explanation:

1. Methods based on the principle of biosis, that is, maintaining life processes in the raw materials and use of its natural immunity.

2. Methods based on the principle of anabiosis, that is, slowing, suppressing the vital activity of microorganisms and vegetable raw materials with the help of various physical, chemical and biological factors.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.