natral selection and evolution

Question 1

natural selection

Answer 1

process where organisms shows variation and better adapts to their environment. this increases survival causing the organisms to produce more offspring and pass on the genes

Question 2

evolution

Answer 2

gradual change of species overtime
started with bacteria

Question 3

evolution vs natural selection

Answer 3

evolution occurs over a long period of time

natural selection is an event which causes the survival of the fittest

Question 4

what are fossils

Answer 4

fossils are formed when animal and plant remains or traces are preserved in rocks.

Question 5

fossil layers forming a sequence showing that organisms have gradually changed over time

Answer 5

fossil record

Question 6

how does a fossil form

Answer 6

organism dies
flesh rots leaving skeleton covered in sand soil or clay
skeleton becomes mineralised which turns it into rock
the rocks shift in the earth with the fossil trapped inside
erosion takes place when fossil emerges

Question 7

how fossil record provides eveidence for evolution

Answer 7

fossil of simple organisms are found in the oldest rocks
more complex organisms are found in recent rocks
this supports the theory that simple life forms gradually evolved into more complex ones

plant fossils appear before animals reinforcing that animals require plants to survive

Question 8

molecular comparison

Answer 8

closely related species have similar dna. they look at the order of nucleic acid bases or amino acids in protein

Question 9

artificial classification

Answer 9

grouping organisms based on observable charcteristics