The immune system has many kinds of white blood cells to fight infections. HIV finds the white blood cells, called CD4 cells. But with cancer the white blood cells are being killed off.
Both the nitrogenous base and phosphate group are attached to the deoxyribose sugar in DNA.
I believe the answer is A. It does not include bacteria, fungi, or protist.
<span>Convention on biological diversity is a treaty that aim to conserve the biodiversity. It clearly acknowledges the importance of biodiversity and aim to safeguard the biodiversity. Seed banks help in preventing a plant from extinction. The convention focused on animal and plants, but rarely mention bacteria, fungi, and protist.</span>
Answer:
Five hundred out of every one thousand rats would die
Explanation:
Median lethal dose LD-50 (lethal dose 50%) is used as a measure of poisoning potential of a substance. LD-50 is the dose of substance, given all at once, which causes the death of 50% (one half) of a group of test animals. LD-50 is usually expressed as the amount of chemical administered (e.g., milligrams) per 100 grams or per kilogram of the body weight of the test animal. In this example, the test animals were rats, they were administrated a certain insecticide. Administration methods that are the most common are dermal (applied to the skin) and oral (given by mouth). If the determined LD-50 is 250 milligrams per kilogram of body mass, it means that one half (five hundred) of one thousand rats would die, because we are talking about lethal doses.
