Wolves are causing a trophic cascade of ecological change, including helping to increase beaver populations and bring back aspen, and vegetation.beavers.
I believe it is burning fossil fuesl
The allele for sickle cell anemia would be an example of natural selection. In most situations, having crescent shaped red blood cells would hold less oxygen & would not be ideal. But in places that are affected by diseases like malaria, which attack red blood cells, having crescent blood cells minimizes the threat malaria can cause.
Hope this helps!
Answer:
tetanus toxoid.
Explanation:
Okay, things to note from the question above are: the medical student had four injections in or before she clocked 12 years of age.
The four injections given to the student when she was small should be FIVE instead of the four given for tetanus immunization and she should have been given a booster twice. Now, at 23 years old, is bitten by a mouse while performing an experiment. Sine she was not immunized against tetanus while she was young she should be given a tetanus toxoid.
Also, her wound should be closed since tetanus enters the body through a cut it say an open wound. The tetanus toxoid helps in the immunity against tetanus.
