Describe the system of measurement most scientist use when collecting data and doing experiments

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.

Using meiosis, the sporophyte produces spores that are .

Pulmonary arteries carry highly oxygenated blood. true or false?