Write a paragraph on what is biology

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.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

Drag each label to the correct location on the chart. match the function to the type of tissue