Prokaryotic cells evolved about ________ years ago

Fill in the blank(s) with correct word


3.5 billion

Biology & Microbiology

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In which of the types of hearts is oxygen-rich

and oxygen-poor blood mixed?

a. two-chambered b. three-chambered c. four-chambered d. two and three-chambered e. all three types of hearts

Biology & Microbiology

The Internet has been used as a rapid means to obtain information, including scientific ideas. Which one of the following statements about the Internet as a source of scientific information is FALSE?

A) At present, the Internet is less regulated than broadcast and print media. B) Anyone can post "scientific" information, regardless of whether the information is misleading or not true. C) Information on the Internet is generally very reliable because inaccurate information is quickly removed or corrected. D) Individuals and/or groups may post information to promote their own personal interests rather than ideas that have been tested through the scientific process.

Biology & Microbiology

Populations that have been relatively undisturbed by humans normally grow, with no limits set by their environments

Indicate whether the statement is true or false

Biology & Microbiology

The West Nile virus is classified as a(n)

A) rhinovirus. B) coronavirus. C) togavirus. D) flavivirus. E) enterovirus.

Biology & Microbiology