1. cells that protect the body by engulfing foreign cells or producing antibodies are
a. red blood cells
b. cilia
c. platelets
d. white blood cells
2. the circulatory system includes the
a. lungs, heart, and brain
b. lungs, blood vessels, and heart
c. heart, blood, and blood vessels
d. heart, arteries, and lymph
3. the protein found in red blood cells that transports oxygen is called
a. hemoglobin
b. fibrinogen
c. prothrombin
d. thrombin
4. the large flat muscle that contracts and alters the volume of the chest cavity is the
a. trachea
b. epiglottis
c. diaphragm
d. larynx
5. another name for a fertilized egg is a
a. gastrula
b. placenta
c. blasocyst
d. zygote
6. which of the following is not an endocrine gland?
a. pituitary gland
b. parathyroid gland
c. sweat gland
d. adrenal gland

the right answer is a. skin cells forming from sunlight.

the liver is an organ endowed with a fantastic ability to regenerate

. thus, if a hepatectomy (ablation) of 70% of the hepatic mass is performed in the rat, there is complete recovery in 7 to 10 days.

prokaryotes are beings that have existed since the existence of life on earth, and do not come from another realm.

ribosomes are organelles that exist naturally in eukaryotes, either in free form or attached to the endoplasmic reticulum.

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question: which statement best describes the different properties of metals?

answer: they are shiny and bend without breaking.

since metals have certain characteristics properties, they include the following: they are ductile, malleable, shiny, hard, lustrous, flexible and they are good conductor of heat and electricity. so therefore, metals are not dull and they are not non-flexible as listed. instead, they are shiny and flexible.

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