Stem cells, both during development and during the rest of an animal's lifespan, remain , conducting mitosis repeatedly to give rise to more stem cells as well as some cells that go on to specialize into particular mature cell types. g

The answer is a. i hope this

Sugar + oxygen > carbon  dioxide + water + energy  c6h1206 + 6o2 > 6co2 +6h2o + energy  and the numbers after the element symbols are small.     

The answer to this will be from your lab notes/procedure. it would be best to ask another student who participated in the lab as we do not know what was done, what enzyme or if the temperature is celsius or fahrenheit. if i were to guess though i'd say the rate stopped due to enzyme denturing at high temperature