Estructura de soporte interno de la célula por fa aiudaa

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What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures

Which of the following explains why a tree is often used as a model to represent the principle of common descent

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous