Astudent hypothesizes that a goldfish will be more active in a bowl that has red gravel than in a bowl with grey gravel. to test this hypothesis, the student places one goldfish in a bowl with red gravel and another goldfish in a bowl with grey gravel. the color of the gravel is the variable in the experiment.
a) control
b) responding
c) dependent
d) independent

Most materials are not magnetic because their magnetism has worn off. their magnetic domains are arranged randomly. they lack magnetic fields. earth’s heat has destroyed their magnetism.

The reactions of photosynthesis occur in the of plant cell? a.mitochondria. b. lysosomes. c. chloroplasts. d. chlorophyll

Liquid from a brewery fermentation contains 10% ethanol and 90% water. part of the fermentation product (50,000 kg/h) is pumped to a distillation column on the factory site. under current operating conditions, a distillate of 45% ethanol and 55% water is produced from the top of the column at a rate of one-tenth that of the feed. what is the composition of the waste "bottoms" from the still?