Each Choice Below Describes How a Few Astronomical Phenomena Are

question 116

Multiple Choice

Each choice below describes how a few astronomical phenomena are related to time periods. Which list is entirely correct? (Careful: some lists are partially correct.)

• A)Earth's rotation defines a day. The Sun's rotation defines a week. The Moon's rotation defines a month. Earth's orbit defines a year.
• B)Earth's rotation defines a day. The saros cycle of eclipses defines a month. Earth's orbit defines a year.
• Earth's cycle of axis precession takes 26,000 years.
• C)Earth's rotation defines a day. The cycle of the Moon's phases takes about a month. Earth's orbit defines a year.
• Earth's cycle of axis precession takes 26,000 years.
• D)Earth's rotation defines a day. The cycle of the Moon's phases takes about a week. Earth's orbit defines a year.
• Earth's cycle of axis precession defines a month.

---

Definitions:

Viral Genome

The complete genetic material of a virus, which can be composed of either DNA or RNA, and determines the structure and function of the virus.

Host Chromosomes

The chromosomes found within an organism that serves as a host to a virus, parasite, or another type of symbiont.

Retroviruses

A group of RNA viruses that insert a DNA copy of their genome into the host cell in order to replicate, like HIV.

Reverse Transcriptase

An enzyme used by retroviruses to transcribe their RNA into DNA, which allows viral integration into the host genome.