What is a test cross a cross of two unknown forms to determine their genotypes?

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.

Look at the photo of the leaf. which term best describes this leaf?

If animal agriculture was eliminated, how much grain would become available for human consumption?