Boron (B) has two isotopes, boron-10 and boron-11. The atomic weight of boron is the .
A) combined masses of boron-10 and boron-11
B) average number of neutrons in boron-10 and boron-11
C) weighted average of the masses of boron-10 and boron-11
D) mass of boron-10 minus the mass of boron-11

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.

The table below shows the number of foot bones in some horse fossils.horse fossil recordhorse fossil number of foot bonesp 19q 17r 24s 13ancient horses had more bones in their foot then present-day horses. the present-day horse has 11 foot bones. what is the correct order of evolution of the horse starting from the youngest fossil? a. q p r s b. s r p q c. s q p r d. r p q s

In a cross between individuals of a species of tropical fish, all of the male offspring have long tail fins, and none of the females possess the trait. mating two of the f1 fish fails to produce females with the trait. explain the inheritance pattern of the trait.