Which of the following is always an important part of an experiment?

1.making a working model

2.observing things in nature

3.making drawings of things observed

4.identifying and controlling variables

The most important part of an experiment would be; identifying and controlling variables.

In order to set up an experiment, you need to test the specimen(s) with and without a curtain variable. That is what makes an experiment a test.

identify and controlling variables

Explanation:

lack of awareness of control variables can lead to faulty result or what are called "confounding variables" additionally, noting control variables makes it easier to reproduce and experiment and establish the relationship between the independent and the dependent variable

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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the answer to your question is b