A student placed yeast in four flasks of warm water. She added different nutrients to each flask. Then she placed a balloon over the neck of each flask. After 30 minutes she measured the diameter of each balloon a) Which variable did the student change?

b) Which variable did she measure?

c) Name the gas that fills the balloon

d) Name the reaction that produces the gas.

e) Name the nutrient that lets yeast respire fastest

Could someone me with number one you

An animal cell (left) and a plant cell (right) are shown.which organelle, labeled x in the diagram, is found in both plant and animal cells?

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.