Mammals use their lungs to provide oxygen for themselves from the air. Fish spend a majority of their time in the water, and instead, developed gills. What is the function of gills? * a-Gills break down water into hydrogen and oxygen so the fish can use the oxygen.

b-Gills allow the fish to breathe oxygen in the water and the air.

c-Gills allow the fish to use the oxygen that is dissolved in the water.

d-Gills allow the fish to use the oxygen in the air, but use it more slowly so they can live in water.

The Barber's have a circular flowerbed in their front yard. The want to put fertilizer on ha

The answer is a I think

C

Explanation:

a fish cant breath outside water

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

the dependant variable is spilled water

the independent is the heat