Which diagnostic test is used to detect pyelonephrosis and hydronephrosis?

What is the lethal concentration, 50% kill?

a. The amount of a substance, measured in milligrams per body mass, that kills half of a group of laboratory animals to which the substance is administered during a preestablished time b. The concentration of a substance, measured in parts per million, that kills half of a group of laboratory animals to which the substance is administered during a preestablished time c. The concentration of a substance, in milligrams per kilogram (mg/kg), that kills a laboratory animal within 48 hours d. The concentration of a substance to which workers can be exposed continuously for a period of approximately 15 minutes without suffering irritation, chronic or irreversible tissue damage, or narcosis sufficient to increase the risk of accidental injury, impair self-rescue, or materially reduce work-related efficiency

When sending an e-mail, what should you do to prevent it from being filtered as junk mail?? A) Keep your message under 500 words

B)Make sure that the subject line states content of message. C) Use proper grammar and punctuation. D)Make sure your e-mail address is verified.