Amineral
a.
has a chemical formula.
c.
has a characteristic internal structure.
b.
occurs naturally.
d.
all of the above.

What organ systems are working to you cool down after a workout?

Ineed to get this test done which of the following statements is correct in hour our immune system responds to a potential pathogen? a.) the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. b.) b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c.) the adapted immune system will call on the innate immune system to destroy the pathogen. d.) the t-cells in the adapted immune systems are the first to recognize the pathogen

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird