Which of these describes a quantitative observation? a) an observation of the phenomenon itself b) an observation of the relative size of something c) an observation of an effect the phenomenon has d) an observation that has a number associated with it asap! 20 points!

Which of the following describes a boom period? a. as one population increases, another population decreases. b. as one population increases, the other population also increases. c. as one population decreases, another population increases. d. as one population decreases, another population also decreases

What type of plant is good for a bioassay and where can i buy it? i only have a month.

Vessels draining the myocardium of the heart, open primarily ,into which chamber?