Kinda blurry but please answer no files team a practises by pulling a rope tied to a tree

the team pulls with force of 1200N but the tree does not move
what is the force of the tree on the rope? tick the correct box

1)zero 2) less then 1200N 3)1200N 4)more then 1200N

What is the term for the two sets of chromatids formed in the parent cell a.haploid b.diploid c.gamete d.tetrad

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

What substance acts to prevent sudden ph changes in bodily fluids?