The Ratio of C3 to C4 Plants in a Paleoenvironment

question 4

Multiple Choice

The ratio of C3 to C4 plants in a paleoenvironment can be estimated using the ratio of two stable isotopes of which element derived from fossils or ancient soils?

• A)oxygen
• B)nitrogen
• C)carbon
• D)strontium

---

Definitions:

Urinated

The act of expelling urine from the bladder through the urethra to the outside of the body.

Infectious TB

Tuberculosis that is active and contagious, caused by the bacterium Mycobacterium tuberculosis.

Prescribed Antibiotics

Medications ordered by a healthcare professional to treat or prevent bacterial infections.

Jehovah's Witness

A member of a Christian denomination known for non-participation in certain government or social practices like military service and blood transfusion based on their beliefs.