Answer:
In animal field studies, why do scientists usually try to work without making the animals aware that the humans are present? It is necessary to observe the animals without disturbing them. When a controlled experiment is not possible, why do scientists try to identify as many relevant variables as possible?
The fern is a popular seedless vascular plant.
Edward Jenner first "discovered" a vaccine for cowpox, which provided immunity for smallpox.
This statement above is TRUE.
Anthrax is an infection that is caused by the bacteria Bacillus anthracis. The infection is spread by contact with the spores of the bacteria. The bacteria affect the respiratory system and cause the lungs to collapse leading to death.
Some countries have developed anthrax as a weapon of war.
True is the answer to your question
