Which of the following are indicators of a chemical attack

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

How do you know that the plant cells in these two images have different jobs, or functions? a. because all plant cells serve different functions b. because they are two different colors c. because their dna are different d. because their structures are different

There are only about 250,000 known fossil species. true or false