Physics

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Do all comets have tails? Explain how comets form their tails. What will be an ideal ... Started by jake	1 Replies 132 Views	Jul 27, 2018 by cswans24
Explain the phenomenon of Kirkwood gaps. Where can they occur? What will be an ideal ... Started by tsand2	1 Replies 44 Views	Jul 27, 2018 by macybarnes
The physical bases of life on Earth are oxygen and water. a. True b. False Indicate whether the ... Started by melina_rosy	1 Replies 55 Views	Jul 27, 2018 by jharrington11
Natural selection is random. a. True b. False Indicate whether the statement is true or ... Started by Themember4	3 Replies 114 Views	Jul 27, 2018 by Jossy
One theory for the origin of life proposed that reproducing molecules may have arrived here from ... Started by Mr. Wonderful	1 Replies 31 Views	Jul 27, 2018 by fraziera112
Earth required only 1 million years to produce the first cells and another million years for ... Started by vHAUNG6011	1 Replies 146 Views	Jul 27, 2018 by bbburns21
Earth sends out more signals into space by accident than with intent. a. True b. False Indicate ... Started by Haya94	1 Replies 37 Views	Jul 27, 2018 by Sammyo
Half the stars in the Milky Way Galaxy are members of a binary system, many of which are likely to ... Started by Coya19@aol.com	3 Replies 49 Views	Jul 27, 2018 by zenzy
A unique property of water is that it ____. a. has a high heat capacity b. can easily expand c. ... Started by go.lag	1 Replies 46 Views	Jul 27, 2018 by sultansheikh
The function of an enzyme is to ____. a. carry coded information to the rest of the cell b. ... Started by Bob-Dole	1 Replies 33 Views	Jul 27, 2018 by ndhahbi
In Miller and Urey's experiment, what did they use to simulate the atmosphere in a sealed, glass ... Started by lb_gilbert	1 Replies 54 Views	Jul 27, 2018 by peter
What organism today is most similar to the first cells on Earth? a. diatoms b. protists c. ... Started by bio_gurl	3 Replies 52 Views	Jul 27, 2018 by lauravaras
Why couldn't life originate on the Moon? a. too many craters b. not within a habitable zone in ... Started by asmith134	1 Replies 105 Views	Jul 27, 2018 by brittanywood
Which moon is rich in organic molecules but too cold to support chemical evolution? a. Europa b. ... Started by elizabeth18	1 Replies 69 Views	Jul 27, 2018 by qytan
Which type of main-sequence star(s) is a good candidate for searching Earth-like planets with life? ... Started by haleyc112	1 Replies 147 Views	Jul 27, 2018 by sylvia
What is a key limitation to traveling outside our Solar System in search for life? a. We have the ... Started by Sufayan.ah	3 Replies 109 Views	Jul 27, 2018 by kilada
What did astronomers use in the anticoded message sent to globular cluster M13? a. dashes and ... Started by K@	1 Replies 36 Views	Jul 27, 2018 by kaykay69
What are the rungs of a DNA spiral made up of? a. RNA b. four chemical bases arranged in pairs ... Started by Destiiny22	1 Replies 71 Views	Jul 27, 2018 by hugthug12
What part of a cell stores the coded information? a. cell membrane b. cell wall c. cytoplasm d. ... Started by Themember4	1 Replies 99 Views	Jul 27, 2018 by heinisk01
What technology do astronomers use to search for extraterrestrial life? a. space observatories b. ... Started by jho37	3 Replies 181 Views	Jul 27, 2018 by frre432
Why do astronomers narrow their search to the habitable zone of other star systems? a. the most ... Started by jlmhmf	1 Replies 45 Views	Jul 27, 2018 by Kedrick2014
Which telescope did astronomers use in 1974 to send an anticoded message to globular cluster M13? ... Started by Medesa	1 Replies 39 Views	Jul 27, 2018 by ecabral0
What period of Earth's geologic history saw a dramatic increase in life? a. Cretaceous b. ... Started by crobinson2013	1 Replies 54 Views	Jul 27, 2018 by jaygar71
In all living things on Earth, the chemical reactions making, breaking, and combining carbon chains ... Started by burton19126	3 Replies 185 Views	Jul 27, 2018 by flannelavenger
Genes are organized into long coiled chains called _______________. Fill in the blank(s) with ... Started by waynest	1 Replies 53 Views	Jul 27, 2018 by dawsa925