Proceedings of the Biological Society of Washington 1-3
Proceedings of the Biological Society of Washington 1-3
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43 of them. A discussion of formerly existing vegetable forms would also be of great interest, but I must omit all except incidental reference to that subject also.
In all investigations into the history of ancient life upon the earth, regard must be had to the functions that animals perform, and to the conditions under which those functions are executed.
The requisite conditions for the performance of the physiological functions in the simplest animal forms, the Protozoa, for example, render i...t practically certain that the primary origin of animal life Occurred in water; and it doubtless occurred in the sea. The first animal life having necessarily been of aqueous origin, we must assume that the first air-breathing animals were developed from those of aqueous respiration.
Fresh-water mollusks and fishes, especially the former, have, I believe, primarily become such by a change from their originally marine habitat, mainly by compulsion; that is, their progenitors lived in the sea and became land-locked by the unequal elevation of the sea bottom upon, or over which, they lived while the conti- nental areas were in process of elevation.
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To quickly assess the difficulty of the text, read a short excerpt:
43 of them. A discussion of formerly existing vegetable forms would also be of great interest, but I must omit all except incidental reference to that subject also.
In all investigations into the history of ancient life upon the earth, regard must be had to the functions that animals perform, and to the conditions under which those functions are executed.
The requisite conditions for the performance of the physiological functions in the simplest animal forms, the Protozoa, for example, render i...t practically certain that the primary origin of animal life Occurred in water; and it doubtless occurred in the sea. The first animal life having necessarily been of aqueous origin, we must assume that the first air-breathing animals were developed from those of aqueous respiration.
Fresh-water mollusks and fishes, especially the former, have, I believe, primarily become such by a change from their originally marine habitat, mainly by compulsion; that is, their progenitors lived in the sea and became land-locked by the unequal elevation of the sea bottom upon, or over which, they lived while the conti- nental areas were in process of elevation.
What to read after Proceedings of the Biological Society of Washington 1-3?
You can find similar books in the "Read Also" column, or choose other free books by Biological Society of Washington to read onlineMoreLess
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