acer japonica,  acer rubrum, and  acer saccharum  are a)three families of maple trees. b)three different names for the same maple tree. c)three species of maple trees, all in the same genus. d)three varieties of maple trees, all in the same species.

What is the primary goal of human communities?

Plz ! a scientist wants to produce a cow that makes a particular human protein in it’s milk the desired protein causes blood to clot and can be used to treat hemophilia (a blood clotting disorder). which of the following would be best for the scientist to use? a. genetic crosses. b. cloning. c. selective breeding. d. genetic engineering.

Explain how scientists use geologic time to determine the age of landforms.