Fill in the blanks. Photosynthetic life changed the by producing large amounts of and this in turn allowed for to evolve on Earth. Soil microorganisms known as created fertile which is part of the . This allowed for to evolve. Stromatolites created in the which changed erosion, deposition and created many homes for organisms. This increased the of life.

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the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.