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1) element that is a component of bone and teeth. a) helium b) iron c) magnesium d) calcium 2) single-celled prokaryotic organism that is a member of the Bacteria domain. a) protozoan b) protist c) bacteria d) amoeba 3) organ of the digestive system that removes water from food waste and forms feces. a) pancreas b) large intestine c) small intestine d) stomach 4) basic unit of structure and function of living things. a) cells b) sperm c) egg d) sex-linked 5) sex chromosome present only in males. a) X chromosome b) offspring c) recessive d) experiments 6) Sex chromosome present twice in females. a) genes b) chromosome c) X chromosome d) sex chromosomes 7) male gamete. a) sperm b) Y chromosome c) offspring d) sex chromosomes 8) a segment of DNA that carries the genetic code to make a specific polypeptide chain. a) sex chromosomes b) genes c) offspring d) chromosome 9) referring to an allele that is masked by the presence of another allele (called dominant) for the same gene when both are present in a heterozygote; or referring to a trait controlled by such an allele. a) sex-linked b) recessive c) sex chromosomes d) offspring 10) on the X or Y chromosome. a) Y chromosome b) sex-linked c) recessive d) experiments 11) all the living things in a given area together with the physical and chemical factors of the nonliving environment. a) ecosystem b) population c) community d) biome 12) long, narrow, tube-like organ of the digestive system between the stomach and large intestine that carries out most of the chemical digestion and nutrient absorption. a) large intestine b) stomach c) small intestine d) liver 13) organic compound, such as vitamin C, that the body needs in small amounts to function properly. a) carbohydrate b) nucleic acid c) aminoacid d) vitamin 14) body system that consists of skin, mucous, membranes, and other tissues and organs that defends the body from pathogens and cancer. a) circulatory system b) immune system c) nervous system d) respiratory system 15) type of symbiotic relationship in which both species benefit. a) comensalism b) mutualism c) parasitism d) carnivore

Digestive system bacteria

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