Is it normal for a period to not come on for 1 month im worrying

It depends. Your period might sometimes come some days later or earlier because of stress or another thing. It should be fine if it comes one or two days after the date it is supposed to come, if not, well, you might be pregnant or some health problem that has delayed it.

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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it is a learned trait

explanation: