1-
the earth's troposphere is known for being he layer of the atmosphere
select one:
a. that is the highest in elevation above the earth's surface
b. where meteors burn up on their descent
c. that is closest to the earth's surface and contains the weather
d. that contains the ozone layer

as a result of the experiments of lavoisier, you know that in a chemical reaction the mass of the products
select one:
a. cannot be predicted based on the mass of the reactants
b. s less than the mass of the reactants
c. is twice as great as the mass of the reactants
d. always equals the mass of the reactants

this is the site of cellular respiration in all eukaryotes.
select one:
a. lysosomes
b. ribosomes
c. chloroplasts
d. mitochondria

Can bacteria reproduce in a way such that when you start out with two bacteria, you get five bacteria? why or why not? * a. yes, because bacteria reproduce sexually, and can produce any number of offspring, just as humans do. b. no, because bacteria grow at an exponential rate. c. no, because when bacteria reproduce, they split into two parts, and two bacteria splitting would result in four bacteria.

Need with these questions . need the answers in a rush for these questions are the answers i put down are correct or not? ?

On a backpacking trip, kenny hikes all day at a steady pace, covering 30 kilometers and burning 4000 calories. at the school track, janelle runs the 100-meter sprint in 13.5 seconds, burning 10 calories. afterward, janelle’s leg muscles are aching and she is breathing hard, while kenny maintains normal breathing all day, even though he burns 400 times more calories than janelle. which two statements offer the best explanation for this phenomenon? a. if the aerobic pathway—cellular respiration—cannot meet the energy demand, then the anaerobic pathway—lactic acid fermentation—starts up, resulting in lactic acid buildup and "oxygen debt." b. aerobic cellular respiration produces more energy, but its use is limited because of lactic acid buildup in the muscles and the resulting "oxygen debt." c. after about 90 seconds of intense exercise, the muscles become depleted of oxygen, and anaerobic respiration can no longer function to produce atp, resulting in "oxygen debt." d. the rate of energy demand determines how the muscles will obtain energy, either from cellular respiration or from lactic acid fermentation if not enough oxygen is present.