2. Lagyan ito ng pasingawang kawayan upang mabulok kaagad ang basura. 3.
Pumili ng lagayan ng yari sa kahoy, o yero na sapat ang laki at haba.
4. Takpan ng dahon ng
saging o lagyan ng bubong ang sisilan upang hindi ito pamahayan ng langaw at iba pang peste.
5. Mas matagal na proseso ng pagpapabulok ang pinagdaraan ng paraang ito.​

Explanation:

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the answer is d, it has indefinite shape but definite volume.

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- 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