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[填空题]Like all animal species, plant species must spread their offspring to suitable areas
where they can grow and pass on their parent’s genes. Young animals generally spread (1) ______
by walking or flying. Because plants don’t have that ability, they may somehow (2) ______
hitchhike. Some plant seeds scatter by blowing in the wind or floating on water.
Many other plant species, though, trick an animal into carrying their seeds. How do
they do They enclose them within a tasty fruit and advertise the fruit’s ripeness by
its color or smell. The hungry animal collects and swallows the fruit, walks or
flies off, but later spits out the seeds somewhere far from its parent tree. Seeds (3) ______
can thereby be carried thousands of miles. It may surprise you to learn that plant (4) ______
seeds can resist digestion. In fact, some seeds actually require passage through an
animal’s body before they can grow. Wild strawberries offer a g
[简答题] What is a Species
A species of plants or animals, as the term has been generally used by naturalists, comprises all such individuals as are so similar to each other that we may suppose them all to have proceeded from one common parentage, and so dissimilar from all others that they could not have been reproduced from the others, nor the others produced from them.
All we know is, that the plants and animals throughout the world exist in species, each one of which stands at present distinct and isolated wholly apart from all the rest, and one cannot be transformed into another by ordinary generation, through changes of soil and climate, or any other causes whatever known to man, within so short a period as six thousand years.
The apple, for instance, is one species, and the pear is another. In many respects they are similar to each other, and each may be changed by cultivation and by the operation of other causes a great deal, but by no po