During the systole phase of the cardiac cycle, the left ventricle contracts and blood is pumped into the aorta. which of these valves prevents a backflow of blood into the left atrium? a. aortic valve b. tricuspid valve c. mitral valve

Most crimes involve some evidence relating to the human body; for that reason, what related science is frequently used in forensic investigations? a)psychiatry b)physics c)botany d)biology

(select all the correct choose each statement that is scientific. - the opinions of randomly selected participants in a survey prove the idea that global temperatures are not increasing on earth. - the universe's average temperature and rate of expansion support the idea that it began as one super-dense and hot mass 13.8 billion years ago. - ocean tides are caused by the uneven gravitational pulls of the moon and sun on different parts of earth. - human life is more valuable than other forms of life on earth because humans are more intelligent than other organisms.

What factors contribute to the effect an environmental toxin has on the human body?