Answer:
d
Explanation:
they are all parts of the cell theory, cells replicate making a true, b and c are true because cells are the basic unit of life so any living organism will have cells.
Answer:
Explanation: They are considered of high importance in scientific research due to the fact that they have had a great impact on animal and human health. For instance, it has been discovered that biofilm formation may increase bacteria resistance to antibiotics and immune response of the host.
All of the land and shallow estuarine area between the two northernmost passes of the Mississippi River and the Gulf of Mexico.
Westward expansion meant that the US acquired ever increasing amounts of land, and needed people, farmers, to settle there so it could maintained without a huge military presence. This led to massive immigration in the second half of the 19th century, as mostly Europeans came here seeking to finally have their own land.
It also added vast resources to the United States, both in terms of potential agricultural production and things like gold, silver and timber.
It stimulated the construction of the Transcontinental Railroad, and added new states to the country.
It further aggravated the divide between north and south, and accelerated the onset of the Civil War.
