Catalase is an enzyme that breaks down hydrogen peroxide (H 2
O
2
) into water
and oxygen. A student conducted an investigation to study the effect of catalase
concentration. The volume of oxygen released during the reaction was measured
by the amount of water displaced in a graduated cylinder. The table below shows
the results for the five samples.

What have we learned from fossil evidence about evolution? a) it is an abrupt change. b)the process is observable. c) it takes place during one lifetime only. d)the most complex traits are always selected.

To maintain asepsis when administering an injection, all parts of the syringe can be handled except the:

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.