What does the presence of only two tissue layers make cnidarians? endodermic diploblastic ectodermic none of the above

What is the first step in a life cycle of a plant reproduce sexually

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

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