Biology by Julian Sutton (auth.)

By Julian Sutton (auth.)

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The surfaces of day particles may have provided a place for long-chain molecules such as RNAs to form. • RNAs can act as both information stores and catalysts. They were probably the first self-replicating molecules. DNA, enzymes and cells came later. • The possibility of extra-terrestriallife raises exciting issues, but does not change the basic questions about the origin oflife. 1. Biologists tend to tell evolutionary stories, hypotheses about how a characteristic might have evolved. The following story is rooted in an old and discredited idea about how evolution could take plaee.

Others are hortfculture and sport. Very dffferent breeds of not, suggesting that whole groups of organlsms cat, cabbage and cow have been selected over tens, hundreds orthousands ofyears. ninct. Some groups are method 15 to select Individuals with deslrable characteristics and breed trom them, then found as fossils In rocks formed only after a repeat the process on the offspring, and so on. a in time. This suggests that new groups If striking differences can be selected artificlally have appeared durlngthe hlstoryof the this Qulckly.

A coelom can develop in several ways, but the gut always ends up suspended in the cavity by strands of issue called mesenteries. All the following animal phyla have a coelom. Members of dass Oligochaeta mostly live in soil or fresh water. They indude the earthworms. Oligochaetes have chaetae attached singly or in pairs, and have no distinct head. Class Polychaeta indudes many marine worms such as the lugworm and ragworm. The head is more distinct, and chaetae are in large groups on either side of each segment.

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