If significant amounts of fossil fuels continue to be used to support energy needs, what will be a negative impact for our planet? A. a decrease oxygen levels, leading to lower air quality
B. increased air pollution, leading to better human health
C. decreased water quality, leading to increases in marine diversity
D. increased levels of carbon dioxide, leading to warmer global climates

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.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.