Fill in the blank As we look around space we find that most of it is composed of (4) of hydrogen. When the hydrogen combines with carbon it forms a (5), which is the basis for all living things. Combining different (6) together form different substances. A group of two or more atoms that are bonded together is called a (7). And when the elements are combined in a specific way, or ratio, the substance is called a (8) (e. g. water).

Equal numbers of moles of he(g), ar(g), and ne(g) are placed in a glass vessel at room temperature. if the vessel has a pinhole-sized leak, which of the following will be true regarding the relative values of the partial pressures of the gases remaining in the vessel after some of the gas mixture has effused?

Growing crops in places where major pests don't live using beneficial insects to eat harmful insects using a rat trap instead of a rodenticide developing drought-resistant tomato plants using beneficial insects or natural oils to repel pests planting a different crop every year to fake out the pests keeping food covered to deter ants and rodents developing bean plants with a resistance to fungus picking caterpillars off tomato plants cultivation practice biological control cultural control genetic resistance natural chemicals

How many energy levels contain electrons in an atom of zirconium (zr)?