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没有人能确切地说地球上到底有多少种生物。到目前为止,已发现的生物种类超过了170万。生物多样性是指在一定时间和一定地区所有生物(动物、植物、微生物)物种及其遗传变异和生态系统的复杂性总称。比一比:你那儿有多少种生物?步骤一:拿两个装满种子的杯子和一个纸盘。A杯中的种子是从A区公园中采集的,B杯中的种子是从B区公园中采集的。步骤二:将A杯中的种子倒在纸盘里,按类型分类。数一数不同种类的种子数。这个数字代表这一区中不同生物的种类。步骤三:将种子倒回A杯中。步骤四:对B杯重复步骤二和步骤三。步骤五:同学们共同探讨研究结果,计算每一类区域中不同类型种子的平均数量。
No one can tell exactly how many creatures are on earth. So far, more than 1.7 million species have been found. Biodiversity refers to the general term for the complexity of all living things (animals, plants, microorganisms) and their genetic variations and ecosystems at a certain time and in a certain area. Ratio: How many creatures do you have? Step one: Take two cups filled with seed and a tray. The seeds in cup A were collected from Park A, and the seeds from cup B were collected from Park B. Step 2: Pour the seeds from cup A into the tray and sort by type. Count the number of different kinds of seeds. This number represents the species of different living things in this area. Step three: the seeds back to cup A. Step 4: Repeat Step 2 and Step 3 on the B cup. Step Five: The students discussed the research results together and calculated the average number of different types of seeds in each type of area.