WHOEVER ANSWER THIS PROBLEM WILL EARN BRAINLIEST!! Which characteristics are common to most salamanders? Check all that apply.

They undergo internal fertilization.
They lose their tails as adults.
They have wet, moist skin.
They have long, strong legs.
They begin life with gills.

What is the next step in muscle contraction after the actin changes shape? (apex)

What is the farthest destination to date for a human spaceflight mission?

Which of the following statements is correct in hour our immune system responds to a potential pathogen? a. the adapted immune system will call on the innate immune system to destroy the pathogen. b. b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c. the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. d. the t-cells in the adapted immune systems are the first to recognize the pathogen vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a. antigen, antibody b. antibody, antigen c. antibody, antibiotic d. antibiotic, antibody