选词填空

come to exist,   be very similar to,   be regarded as,   be crowded with,   evolve from,   begin with,   a variety of

【小题1】He noticed that some species of animals _______________each other.
【小题2】Many people refused to believe that living things,   including humans,   had _______________ lower forms of life.
【小题3】Today,   On the Origin of Species _______________ one of the most important works ever written.
【小题4】It has changed ideas about life on Earth forever. And it all _______________ the journey on the Beagle.
【小题5】As he studied these,   he asked himself the question:   how did different species _______________?
【小题6】The old town square _______________ people.
【小题7】When the Beagle reached the Galápagos Islands in 1835,   Darwin saw _______________ new species.