Biology, 13.04.2021 15:10 marahkotelman
2. From about 4 billion years ago to about 2.5 billion years ago, oxygen gas 2 points
became more common in Earth's atmosphere. Oxygen was a toxic
compound to most life forms from that time period. Today, oxygen is
required by all but some of the most primitive life forms. Which statement
best explains how early life forms that were harmed by oxygen evolved
into today's life forms that require it?
A Warming temperatures allowed the colonization of land environments, where
oxygen was more plentiful
B. Over time, many species gradually adapted to a more oxygen-rich environment,
allowing them to survive in shallow water and on land
C. Carbon dioxide-using species all became extinct, which allowed oxygenusing life
forms to flourish in shallow oceans.
D The growth of seas allowed early species to survive by using dissolved carbon
dioxide in seawater rather than using it directly from the air
3. Which sequence of events best describes the current theory of the
origin of life on Earth?
Answers: 3
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What function does the limb sever in each animal? how are the limb bones of the four animals similar? based on these similarities what can be inferred about the evolution of the four animals.
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Hormones are chemical molecules produced by endocrine glands. one such endocrine gland is the thyroid gland, which synthesizes the thyroid hormone, which in turn affects the heart muscles. which two statements describe the probable reason for the function of the hormone? the cells in the heart have specific receptors that allow for the intake of hormones. the heart and the endocrine glands have the exact same types of cells. all cells make the same types of hormones. thyroid hormones show their effect on the heart by means of specialized cells. thyroid cells and cardiac cells have different dna.
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What is it called when part of a cell membrane closes around a molecule to allow the molecule to enter the cell? a. passive transport b.diffusion c. endocytosis d. exocytosisc. endocytosis
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2. From about 4 billion years ago to about 2.5 billion years ago, oxygen gas 2 points
became more c...
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