Which two ions can the kidney preserve or excrete to regulate the blood ph?

Which pattern most likely came from a gunshot and which one was produced from a blow on the head? explain your answer?

The united states produces an average of 429 billion pounds of food annually. about 133 billion pounds of that food ends up as waste.the percentage of food that the united states wastes each year is %.

Freckles are a dominant trait in humans. both of the girls have the genotype ff for freckles. if either one marries a man with no freckles, what are the chances that their children will have freckles?