Photosynthesis is vital for maintaining levels of atmospheric oxygen. true or falcetrue - photosynthesis is vital for maintaining levels of atmospheric oxygen.

True

Explanation:

It is true that the the process of photosynthesis is important for the maintaining the level of both the gases in the atmosphere.

When the process of photosynthesis starts carbon dioxide and water is used by the plants to produce glucose and oxygen.

This is how the level of carbon dioxide and oxygen is maintained on earth. There is no other process on earth which releases oxygen into the environment.

- 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

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.