A keystone species helps define an entire ecosystem. Without its keystone species, the ecosystem would be dramatically different or cease to exist altogether.
The children's father must also carry the recessive allele. Recessive alleles only determine characteristics when a child inherits a copy from each parent.
Answer:
Paired lungs
Explanation:
Paired lungs comprise the respiratory system of a bird.
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D. He saw that the continent fits together like pieces of a jigsaw puzzle
as well, he had evidence from having similar rock formations from places that seemed to "connect", and he found fossils of the same dinosaur in different areas, that would have been impossible to go to because of the size and the inability to swim by the dinosaurs
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