Gases in both Earth's atmosphere and oceans have changed over its history. Scientists noted oxygen spikes in both the oceans and the atmosphere that coincide with changes in species on Earth. They report that the first oxygen spike resulted in a change from the microscopic life forms of 635 million years ago to large algae around 551 million years ago. A second oxygen spike occurring around 550 and 542 million years ago, according to the fossil records, resulted in an increase in

the sun's light combined with the visible wavelenghts form what is called ultraviolet radiation, which are the long waves at the end of a visible light sprectrum.

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bioteacher101

the correct answer is anaphylaxis.

anaphylaxis is a condition caused by insect bites, foods, medications, manifested by tongue swelling, shortness of breath, vomiting, low blood pressure. it sometimes may occur without an obvious reason. it is treated with epinephrine injection.other tretments include antihistamines and steroids,

segmented body, an exoskeleton made from chitin, and joint appendages.