Which of these can be decomposed by a chemical change?

B) CO

Explanation:

Chemical decompsition or breakdown is defined as the process in which a substance can be broken down into simpler compounds through chemical means.

CO or carbon monoxide can be decomposed by chemical change because it can be broken down into into carbon and oxygen.

While Co (cobalt), Cr (chromium), and Cu (coppoer) are present in its simplest form and can not be decomposed further.

Hence, the correct answer is "B) CO".

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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