The a B C of Evolution
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No doubt they "kept one leg in the water," so to say. They preferred to live in water as far as they could. But there was a desperate struggle for food in the crowded waters, while the land had as yet LAND LIFE BEGINS 43 no other large animals on it, and was becoming rich in insect food. As these lung-fishes lived more and more on land, walking on their fins, the broad paddle of the fin was slowly converted into a strong and flexible bony stem — the leg. These ancestral quad- rupeds had at firs...t two pairs of fins, as some fishes have to-day. The two pairs of fins gradually became legs, with five toes (made out of five rays of the fin) at the end. The lungs continued to improve. The amphibian — ^father of our frogs and newts — ^made his appearance. The quadruped race was born.
Let us glance again at the vegetation. I have said that there was no cold or winter anjnvhere on the earth. We know this because the fossil plants we find are all of a semi-tropical character. As there was thus no winter chill, the plants throve luxuriously, from pole to pole, all the year round.
What to read after The a B C of Evolution?
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:
No doubt they "kept one leg in the water," so to say. They preferred to live in water as far as they could. But there was a desperate struggle for food in the crowded waters, while the land had as yet LAND LIFE BEGINS 43 no other large animals on it, and was becoming rich in insect food. As these lung-fishes lived more and more on land, walking on their fins, the broad paddle of the fin was slowly converted into a strong and flexible bony stem — the leg. These ancestral quad- rupeds had at firs...t two pairs of fins, as some fishes have to-day. The two pairs of fins gradually became legs, with five toes (made out of five rays of the fin) at the end. The lungs continued to improve. The amphibian — ^father of our frogs and newts — ^made his appearance. The quadruped race was born.
Let us glance again at the vegetation. I have said that there was no cold or winter anjnvhere on the earth. We know this because the fossil plants we find are all of a semi-tropical character. As there was thus no winter chill, the plants throve luxuriously, from pole to pole, all the year round.
What to read after The a B C of Evolution?
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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