Answer:Sulfur atoms bonded to oxygen atoms. Like halides, they form where salt water evaporates.
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Answer:
C. they have allowed them to make more observations
Explanation:
Answer:
Adaptive Immune System
Explanation:
The adaptive immune response consists of cellular immunity and humoral immunity. They both involve specialized cells for fighting off bacteria and viruses which is what the adaptive immune system is responsible for.
Explanation:
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D. Precambrian
<span>The Precambrian Era is the longest geological era beginning 4.5 billion years ago and lasting approximately 4 billion years. The Precambrian era is generally separated into two eons the first of which being the Archaean Eon. spanning from around 4.5 billion years ago to 2.5 billion years ago, during this time air temperatures lowered and the water vapour condensed forming the first primeval oceans. This was a period of great volcanic activity when immense lava flows solidified both on the surface and below were transformed into rocks which were then carried by the first rivers to oceans where they were deposited at the bottom of the oceans forming the first sediments. The second eon was the Proterozoic Eon spanning from 2.5 billion years ago to 500 million years ago. </span>
