Fossil 1 --245-65 MYA
Fossil 2.
419-240 MYA
Fossil 3
551-505 MYA
Fossil 4
540-500 MYA
A fossil species is found in the same rock layer with Fossil 3 and Fossil 4. When could this species have existed?
A 500-245 MYA
B.
500-500 MYA
С.
540-245 MYA
D
540-505 MYA

Which of the following statements is true? a. the main cause for speciation is an increase in gene flow. b. organisms that reproduce asexually are not considered part of a species. c. on a tree of life diagram, speciation is shown by the merging of two different lineages. d.the size of the geographic area inhabited by a population can cause speciation.

How does the carbon cycle involve an exchange of carbon

You have just sequenced a new protein found in mice and observe that sulfur-containing cysteine residues occur at regular intervals. what is the significance of this finding? it will be important to include cysteine in the diet of the mice. cysteine residues are required for the formation of α helices and β pleated sheets. cysteine residues are involved in disulfide bridges that form tertiary structure. cysteine causes bends, or angles, to occur in the tertiary structure of proteins.