The fact that many of the larger Jovian moons orbit nearly in the equatorial plane of their host world, moving in the same direction as their planet's spin, suggest that they
A) formed from a rotating disk of gas and dust like a miniature solar system
B) were spun out from the rapidly spinning host world as it formed
C) formed elsewhere in the solar system and were later captured
D) were formed from a giant impact between the host world and another body
Question 2
Why have studies of the geological record not enabled us to determine how life on Earth originated?
A) the first living organisms would have left absolutely no trace of their existence
B) life was planted on the Earth by an advanced civilization so there is no evidence in the geological record to find
C) the geological record does not extend back to the time that life originated
D) the oldest rocks are too deep inside the Earth for us to retrieve
Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
Sedna’s Orbit
Mercury’s Orbit Explained by General Relativity
Viruses must infect a host cell to grow and reproduce
Host-induced restriction and modification