Veins carry blood the heart. a. away from b. towards c. neither of the above d. all of the above user: blood is considered to be a. alive b. lifeless c. unconscious d. none of the above

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.

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca

Write the balanced chemical equation forphotosynthesis.