Findings in Ancient Rocks Indicate Cells First Appeared

question 110

Multiple Choice

Findings in ancient rocks indicate cells first appeared

• A) about 4.5 billion years ago.
• B) about 3.5 billion years ago.
• C) about 2 billion years ago.
• D) before rocks were formed.
• E) before water arrived on Earth.

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Definitions:

Fetal Surgery

A medical procedure performed in utero to treat abnormalities before birth, aiming to improve long-term health outcomes.

Conceptions

The way in which something is perceived or regarded; the beginning of pregnancy.

Abort Spontaneously

A natural loss of pregnancy before the fetus can survive outside the womb, also known as miscarriage.

Neural Tube

Forms during the third week after conception and will develop into the central nervous system (brain and spinal cord).