what relationships can exist between organisms in ecosystems and how do organisms interact in order to survive

What property is electromagnetic

While does kerosene float on water

The number of galaxies in the universe

Calculate the wavelength in nanometers of the light emitted by a hydrogen atom when it's electron falls from the n = 7 to the n = 4 principal energy level. Recall that the engergy levels of the H atom are given by En = - 2.

Fish give off the compound ammonia which has a pH about 7. To which class of compounds does ammonia belong?

When does a spring tide take place? At the beginning of spring Only during the spring season Only after spring is over At any time

The highest cloud are known as

What is the mass of 4.85 X 10^22 atoms of iron (Fe) ?

If element x has 95 protons how many electrons does it have

Which of the following when dissolved in deionized water would make a good conducting solution? a) methanolb) sugarc) baking soda