The hydrogen atom is the simplest one known, consisting of one proton and one electron. The helium atom, which scientist studied next has 2 protons and electrons, yet its mass is 4 times that of hydrogen, can you say why?

1) describe the physical layout of the ocean floor ? 2) explain how the dumbo octopus swims differently than other octopus species and why this would be an advantage in the aphonic zone . 3) why are the types of organisms that live at each underwater hot vent so dramatically different ?

Pastoral farming is best described as a. a method of raising livestock and moving herds b. an african method of agriculture c. a method of cultivating crops on poor soils d. a common method of desert farming select the best answer from the choices provided a b c d

What relationship exists between an enzyme and a catalyst?