What pulls the rocks together to make a planet?
What were the conditions of our Earth 4.54 billion (4540 million) years ago? (Temperature? what gases are available? Solid surfaces?)
What happens when the planet crashes into Earth?
How long does a day last when Earth is first formed? Why?
What is inside the meteors that were striking Earth 3.9 billion (3900 million) years ago?
Why are the ocean’ tides so high and strong 3.9 bya (billion years ago)?
Where do the small islands come from 3.8 bya?
What are the “chemical soup” chemicals responsible for?
What is are the underwater bacterial colonies called?
What organisms are the first to photosynthesize?
What is the single most important element on Earth for life?
What was the name of the supercontinent 1.5 billion years ago?
Answers: 3
Biology, 22.06.2019 03:30, krisgrace1485
Ayoung boy has been found and police are trying to locate his family they take a dna sample from him and begin collec dna samples from families who have missing children if police use dna samples only from the fathers, which type of dn technology can they use to identify the boy's parent? y-chromosome analysis omtdna (mitochondrial dna) analysis vntrs (variable tandem repeats) o pcr (polymerase chain reaction) analysis
Answers: 1
Biology, 22.06.2019 10:00, alexwlodko
Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.
Answers: 1
What pulls the rocks together to make a planet?
What were the conditions of our Earth 4....
What were the conditions of our Earth 4....
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