Answer:
An index fossil is a fossil used to determine the age of the sediments in which it is found. When quickly approximating the age of new finds, an archaeologist looks at the rocks in which it is buried, as those sediments would have been on the surface at the time of the death of the pre-historic creature.
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Answer:
When carbon dioxide dissolves in seawater, the water becomes more acidic and the ocean’s pH (a measure of how acidic or basic the ocean is) drops. Even though the ocean is immense, enough carbon dioxide can have a major impact. In the past 200 years alone, ocean water has become 30 percent more acidic, faster than any known change in ocean chemistry in the last 50 million years.
Explanation:
The genes involved in pattern formation and organization of body parts are called homeobox genes, which are a large family of similar genes.
The h<span>omeobox genes direct the formation of many body structures during early development of the embryo. </span>
Sex linked inheritance usually occurs on the X chromosome. Males have one X, meaning if they receive the specific sex linked gene, they will have the trait. However for a female to possess the trait, she must receive 2 X chromosomes for that trait.
Phages are a positive use of viruses
