Study the diagram of the geologic time scale.

which method is most likely used to identify what happened before the start of the paleozoic era?

a - scientists study fossils from the jurassic period.
b -scientists observe index fossil records of the mesozoic era.
c -scientists examine fossil evidence during the precambrian time.
d -scientists explore the emergence of mammals and humans in the cenozoic era.

Prior to the development of dna fingerprinting, blood type could be used to determine possible parentage. although it might prove someone was not a parent, it could not show if someone was positively the parent, only that he or she might be a parent. which of the following is a true statement that can be made about parentage based on blood typing?

Draw the structure of dna nucleotide with adenine as nitrogenous base

Astudent reads the following text in a science book: scientific evidence tells us that the cause of earths four seasons is the tilt of earth as it revolves around the sound the student is instructed to illustrate this information in a science book. how will the student illustrate winter in the northern hemisphere? a.earths northern hemisphere will tilt away from the sun. b. earths northern hemisphere will tilt toward the sun. c.earths orbit will be farther away than from the sun d. earths southern hemisphere will tilt away from the sun.