Elements and compounds cannot be broken down into simpler substances by an ordinary process

Elements and compounds cannot be broken down into simpler substances by an ordinary process because of the following reasons.

1) Elements cannot be broken down by chemical or physical methods because elements is composed of atoms which are indivisible.

2) Compound cannot be broken down into simpler substances by ordinary process because elements present in the compound are combined with each other chemically.

the right answer is a. skin cells forming from sunlight.

the liver is an organ endowed with a fantastic ability to regenerate

. thus, if a hepatectomy (ablation) of 70% of the hepatic mass is performed in the rat, there is complete recovery in 7 to 10 days.

prokaryotes are beings that have existed since the existence of life on earth, and do not come from another realm.

ribosomes are organelles that exist naturally in eukaryotes, either in free form or attached to the endoplasmic reticulum.

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protist eukaryotes that are not plants, animals, or fungi ("misfits")