Answer: float
Explication: If the density is less than the waters then it will float
Answer:
to find percentage decrease you need to do:
× 100 = percentage decrease
final number equals the number of measle deaths in 2011
initial number is deaths in 1990
hope that helps
The immune system is spread throughout the body and involves many types of cells, organs, proteins, and tissues. Crucially, it can distinguish our tissue from foreign tissue — self from non-self. Dead and faulty cells are also recognized and cleared away by the immune system.
If the immune system encounters a pathogen, for instance, a bacterium, virus, or parasite, it mounts a so-called immune response. Later, we will explain how this works, but first, we will introduce some of the main characters in the immune system.
Human are considered species.
