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9

Basically, they don't. Ecosystems are pretty much either de facto, delimited by geographical boundaries, or defined by us. For example, an underground lake would be an ecosystem and it is organized in such a way for the simple reason that there is no communication between it and any other system. Most ecosystems however, do communicate. For example, we ...


3

Oranges and other fruits are generally not actively made seedless. Rather, seeds may fail to develop due to either lack of fertilization (pollination) or a natural tendency. The natural production of unfertilized and thus seedless fruit is called Parthenocarpy. To quote the Scientific American article (3) mentioned by Oreotrephes: Fruit development ...


2

An ecosystem is a community of living things that exist in conjunction with and rely on nonliving things like a rock, a sandy beach, air, or water. Each organism has an ideal environment, and they may not be able to survive outside that environment. Thus you see a pond with fish living it in next to a forest with squirrels. The division and self organization ...


2

The YAC contains a segment of chromosomal DNA. By using it as a probe they could screen the cDNA library to find cDNAs derived from that genomic region. This would be done by plaque or colony hybridisation. The cDNA clones thus identified represent the "candidate genes" . The last step is a little unclear. Clearly they are identifying cosmid clones that ...


2

That might be a good experiment. I know that before planting bulbs you want to put them in the refrigerator or even the freezer sometimes. In fact this process of cold treating seeds has a name: Stratification. To paraphrase: some seeds become inactivated at higher temperatures like lettuce and delphinium. You can place the seeds in medium and put ...


1

The definition of ecosystem here is missing, but if you mean "an inter-dependency of different organisms that all live in the same geographic region" then I think that competition and cooperation are big drivers of the establishment of these roles. Some animals and plants are so interdependent that they evolve together despite being different species. The ...



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