I really need help! Identify the following molecules as either (not all answers will be used): A. Carbohydrate B. Protein С. Lipid D. Nucleic Acid Н CH, OH ОН R 1 Н НО 3) 4) с CH2OH са О-Н ОН н H-N С 11 2 - 2 fructese H Н Н N N 5) Н- 6) 0= о Гн н н н н н н н Н с-с-с-с-с-с-с-с-с- H 1 1 H н н н н н н Н ор-01 CH2 Nitrogenous base (adenine) НО HH Н Н Phosphate group ОН Н Sugar​

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.

When you run, you begin to breathe heavier and faster. your heart beats more quickly, bringing more oxygen to your cells. which organ systems are working together here?

The earth formed roughly 4.5 billion years ago, yet evidence of life dates back to about 3.5 billion years ago. which one is not a possible hypothesis of how life on earth arose?