D. A keystone species existence keeps an ecosystem in balance.
Because each randomly selected piece of DNA goes into their offspring.
Answer:
the sea otter eats the urchin the the shark eats the otter
The appropriate answer is d. Dead plants in a swampy environment is the perfect environment for the beginning of the coal forming process. Over time layers pile up in this anaerobic environment. The plant or organic material gets buried overtime by dirt or rocks. Millions of years of burial will expose the matter to heat and pressure and will eventually lead to the formation of coal and other petroleum products.
Answer:
A eukaryotic cell has a nucleus.
Explanation:
