B3- Life on Earth

Revision tool for unit B3.
What D is a bird species thought to have been extinct from 1680?. What FB is thought to be the earliest signs of life on Earth?. What O is a gas thought to have been absent in Earth's early atmosphere?. What D was formed from combining molecules and provides the instructions for building new cells?. What FR provides evidence of how species have evolved?. What NS ensures survival of species best adapted to their environment?. What SB sees successful characteristics being chosen to breed into plants and animals?. What V means differences within species?. What H is an idea that can be tested scientifically?. What S do organisms respond to to enable their survival?. What EC carry out a response in multi-cellular organisms? . What CNS enables the brain to coordinate responses to stimuli?. What ES is a body system which relies on the sending and receiving of chemical messages?. What H are chemical signals which enable the body to respond to internal changes?. What I is the hormone which controls how much sugar is in the bloodstream?. What T is a hormone produced by the testes?. What B is significantly larger in Homosapiens than in the extinct Australopithecus Africanus?. What H means 'human-like' species?. What H is the only surviving hominid species?. What CB improve the chances of a species surviving?.

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