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Now, with expert-verified solutions from Biology 1st Edition, you’ll learn how to solve your toughest homework problems. Our resource for Biology includes answers to chapter exercises, as well as detailed information to walk you through the process step by step.
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2 Students’ answers should include reference to: • a system of vessels to carry substances – usually tubes, sometimes following specific routes, sometimes widespread and branching • a way of ensuring that substances move in the right direction • a means of moving materials fast enough to supply the needs of the organism, e.g.
Use shorter intervals of temperature. How was the temperature kept constant – was a thermostatically controlled water bath used and was the temperature checked with a thermometer? Could measure pH with a pH meter.
2 Edexcel AS/A level Biology TOPIC 1 Answers to Student Book 1 questions Biological molecules 2 (a) One water molecule: (b) The electrons are held closer to the oxygen atom because it has eight protons in its nucleus, which is more then the hydrogen atom, which only has one proton. Th erefore the negative electrons are attracted to this