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The respiratory system includes a layer of cells in the air passages that clean the air before it gets to the lungs. This layer of cells is best classified as
receptor sites on the surface of the cell
is part of the genetic code
They have similar base sequences.
competition between members of the species
a tissue
consumers without producers
scientific explanations are tentative and subject to change
pass across the placenta
Scientists in the United States, Europe, and Africa have now suggested that the hippopotamus is a relative of the whale. Earlier studies placed the hippo as a close relative of wild pigs, but recent studies have discovered stronger evidence for the c
receptor sites on the surface of the cell
is part of the genetic code
They have similar base sequences.
competition between members of the species
a tissue
consumers without producers
scientific explanations are tentative and subject to change
pass across the placenta
Which observation could best be used to indicate an evolutionary relationship between two species?
receptor sites on the surface of the cell
is part of the genetic code
They have similar base sequences.
competition between members of the species
a tissue
consumers without producers
scientific explanations are tentative and subject to change
pass across the placenta
Mustard gas removes guanine (G) from DNA. For developing embryos, exposure to mustard gas can cause serious deformities because guanine
receptor sites on the surface of the cell
is part of the genetic code
They have similar base sequences.
competition between members of the species
a tissue
consumers without producers
scientific explanations are tentative and subject to change
pass across the placenta
A stable ecosystem would not contain
receptor sites on the surface of the cell
is part of the genetic code
They have similar base sequences.
competition between members of the species
a tissue
consumers without producers
scientific explanations are tentative and subject to change
pass across the placenta
German measles is a disease that can harm an embryo if the mother is infected in the early stages of pregnancy because the virus that causes German measles is able to
receptor sites on the surface of the cell
is part of the genetic code
They have similar base sequences.
competition between members of the species
a tissue
consumers without producers
scientific explanations are tentative and subject to change
pass across the placenta
Many viruses infect only a certain type of cell because they bind to certain
receptor sites on the surface of the cell
is part of the genetic code
They have similar base sequences.
competition between members of the species
a tissue
consumers without producers
scientific explanations are tentative and subject to change
pass across the placenta
Limited resources contribute to evolutionary change in animals by increasing
receptor sites on the surface of the cell
is part of the genetic code
They have similar base sequences.
competition between members of the species
a tissue
consumers without producers
scientific explanations are tentative and subject to change
pass across the placenta
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