What is the term for the molecule on the surface of a virus that is recognized by the immune system? apex?

Blank is a rock with a find dark texture that makes up the oceanic crust

Stem cells found adult tissue such as in bone marrow brain muscle skin and liver are only capable of what

The serengeti plains are part of the african savanna ecosystem and are home to a variety of different species of plants and animals. the serengeti plains experience a seven-month period of seasonal drought each year, during which the ecosystem receives only four inches of rain and the availability of some resources becomes very scarce. which type of limiting factors does the seasonal drought in the serengeti plains affect?