The answer is A for edgenutiy
Chordates have postanal tails.
B.Chordates have longer tails than nonchordates.
C. Chordate tails are ventral in origin.
The Correct answer is A. i just took a test on this
The respiratory and circulatory system work together to deliver oxygen to body cells.
The respiratory and circulatory systems work together to deliver oxygen to body cells. The respiratory system is responsible for breathing in oxygen and expelling carbon dioxide, while the circulatory system transports oxygen-rich blood to the cells. Within the circulatory system, the heart pumps oxygenated blood through arteries to the body's tissues, where oxygen is delivered to the cells through capillaries.
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The answer is Changes in the shape of earth orbit. If the earth's orbit put the earth closer to the sun, then the global temperatures of the earth would rise permanently. Conversely, if the orbit change puts the earth further from the sun, then the earth global temperature would drop permanently.