2. Which of the following statements is true?
a) All triacylglycerols and all phosphoacylglycerols have the same fatty acids in them.
b) All triacylglycerols have the same fatty acids, but the fatty acids in phosphoacylglycerols vary.
c) The fatty acids in triacylglycerols vary, but all phosphoacylglycerols have the same fatty acids in them.
d) The fatty acids in both triacylglycerols and in phosphoacylglycerols vary.

d) fatty acids in both triacylglycerols and in phosphoacylglycerols vary.

Explanation:

Triglyceride is defined as an ester derived from three (tri- and glyceride) fatty acids and glycerol. Triglycerides, as well as vegetable oil, are the primary components of body fat in humans and other vertebrates.

Phosphoacylglycerols are glycerol triesters in which one group of -OH is esterified with phosphoric acidand and two groups of -OH are esterified with fatty acids, which is then esterified into an alcohol . Phosphoacylglycerols have a configuration of "head and two tails," and are major components of cell membranes.

Hence, the correct statement is d) fatty acids in both triacylglycerols and in phosphoacylglycerols vary.

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.

1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.