Darwinism And the Problems of Life; a Study of Familiar Animal Life
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As a matter of fact, there are not only polyps to - day, but there are millions of minute organisms in every drop of water that consist of a single cell. These are the protozoa.
Since the whole body of the protozoa is a single cell, it cannot be large, nor have different organs, as the organs consist of several cells of different kinds. It is all the more wonderful to find that natural selection has created an infinite variety of forms among the protozoa.
There are the amoebae, small pieces of ...protoplasm with a nucleus, which move about something like beer-froth on a glass plate. If a tiny alga-granule lies in the way of one of these animals, it moves towards it and surrounds it, and the alga finds itself inside the amoeba. Gradually we see a change in the alga-granule. Its digestible parts are assimilated by the protoplasm of the amoeba, and the indigestible remainder is thrust out at some point.
The movement of the amoebae is merely a sort of flow, with constant changes of its shape, but the "flagellates" have on their cell-body one or two lashes PROTOZOA 293 which carry the animal along swiftly by beating the water.
What to read after Darwinism And the Problems of Life; a Study of Familiar Animal Life?
You can find similar books in the "Read Also" column, or choose other free books by Mccabe, Joseph, 1867-1955 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
As a matter of fact, there are not only polyps to - day, but there are millions of minute organisms in every drop of water that consist of a single cell. These are the protozoa.
Since the whole body of the protozoa is a single cell, it cannot be large, nor have different organs, as the organs consist of several cells of different kinds. It is all the more wonderful to find that natural selection has created an infinite variety of forms among the protozoa.
There are the amoebae, small pieces of ...protoplasm with a nucleus, which move about something like beer-froth on a glass plate. If a tiny alga-granule lies in the way of one of these animals, it moves towards it and surrounds it, and the alga finds itself inside the amoeba. Gradually we see a change in the alga-granule. Its digestible parts are assimilated by the protoplasm of the amoeba, and the indigestible remainder is thrust out at some point.
The movement of the amoebae is merely a sort of flow, with constant changes of its shape, but the "flagellates" have on their cell-body one or two lashes PROTOZOA 293 which carry the animal along swiftly by beating the water.
What to read after Darwinism And the Problems of Life; a Study of Familiar Animal Life?
You can find similar books in the "Read Also" column, or choose other free books by Mccabe, Joseph, 1867-1955 to read onlineMoreLess
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