Answer:
C. A fossil is any trace of prehistoric life
Explanation:
None of the other answer choices are reasonable enough to be true. I hope this can help you!
A gene is (in informal use) a unit of heredity which is transferred from a parent to offspring and is held to determine some characteristic of the offspring.
Answer:
At 0 years, an event took place which is known as metamorphosis of igneous rock i.e., formation of igneous rocks from melted magma.
Strontium-90 is a radioactive element which undergoes beta decay to form yttrium-90. It has a half life of approximately 28 years and decay energy of 0.546 MeV. This radioactivity is used by geologist to estimate the age of the rock, fossils, meteorites etc. Other radioactive elements used by the geologists are carbon-40, potassium-40 etc.
Radiometric clock is set when the rock was formed in the past i.e., the moment when an ingenious rock was solidified from molten magma.
Answer
There is not enough antibody-producing clones during development therefore the immune system suffers.
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Explanation: