In comparison to light crude oil, which of the following statements is NOT true with respect to heavy crude oil?
1) heavy crude oil is more difficult to extract
2) most of the remaining oil reserves consist of heavier crudes.
3) oil companies prefer heavy crude oil because it is more profitable.
4 refining heavy crude oil is more expensive.
5) heavy crude oil is more viscous.

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.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds