Can anyone help me out with my science homework ?

Pixels are often referred to using dpi, or dots per inch. true\false

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.

When analyzing tree rings, what do scientists assume a thin ring indicates?