One word answer.) Cars may use coconut and castor bean oils are used in transportation as what?

lubrication

Explanation:

oils are generally slippery and used in lubricating machinery, though never heard of using coconut or caster bean oil, I hope this helped

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

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.