It is true because scientists often do that
Hemoglobin has tetrahedral structure containing four heme groups that surround a globin group.
Heme is ringlike organic compound also known as a porphyrin to which an iron atom is attached. There are four iron atoms that bind four oxygen atoms and transport them to tissues.
Answer:
Because each subject in an experiment has to have equal conditions to ensure the most accurate results. And water temperature is known to impact plant growth. An experiment using different water temperatures is a terribly inaccurate experiment.
Answer:
A reduction in wind should be your answer. I'm so sorry if its wrong. I tired my best
.Oxygen free environments
.Concentrated salt water and hot
. Acidic water of sulfur springs
