Animal Biology

4. a temporary organ that forms during pregnancy, connecting the baby to the uterus and serving as a lifeline by providing oxygen and nutrients while removing waste, via the umbilical cord
6. The blood vessel with thick walls that carries oxygenated blood
9. a large group of organic compounds that includes sugars, starch, and cellulose,
10. the spiral cavity of the inner ear containing the organ of Corti, which produces nerve impulses in response to sound vibrations.
12. internal part of a bird's egg, which is surrounded by the white, is rich in protein and fat, and nourishes the developing embryo.

1. a layer at the back of the eyeball that contains cells sensitive to light, which trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed.
2. an animal with a simple, single-chambered stomach
3. the first stomach of a ruminant, which receives food or cud from the oesophagus, partly digests it with the aid of bacteria, and passes it to the reticulum.
4. the involuntary constriction and relaxation of the muscles of the intestine or another canal, creating wave-like movements that push the contents of the canal forward.
5. scientific name for a red blood cell
7. any of a class of nitrogenous organic compounds that have large molecules composed of one or more long chains of amino acids and are an essential part of all living organisms
8. Rate the number of times your heart beats per minute
11. a common cavity at the end of the digestive tract for the release of both excretory and genital products in vertebrates (except most mammals) and certain invertebrates.