The equation for the chemical reaction shown is not balanced. what number should replace the question mark to balance this equation? 2al + ? cl2 → 2alcl3 a. the number 2 b. the number 4 c. the number 3 d. the number 5

How would you describe an allele that be expressed and determines an organisms appearance? a.uncapitalized b.responsive c.recessive d.dominant

High blood pressure occurs when there is too much blood flowing through the blood vessels at one time. by changing the amount of water in the blood, blood pressure can change. the excretory system can to lower blood pressure.which would most likely occur in the kidney? a)more water would be transferred from the nephron.b)less water would be absorbed into the nephron.c)the amount of water in the bladder would decrease.d)the amount of water in the blood would increase.

What is a quantitative observation? a. an observation that proves the hypothesis is wrong. b. an observation about the number or amount of something. c. an observation about the color, shape, size, or condition of something. d. an observation in which the appearance of something is described using descriptive language.