You are presented with the question "Neurons are the structural and functional units of where what is critical?" and the following answer choices: - organs - Glial cells - nerves - Structural units - voltage - Storage units - Critical care - A computer Now knowing that neurons are the structural and functional units of the nervous system and glial cells perform critical functions in the nervous system, choose the best answer.
Glial cells

You are presented with the question "How many genes are needed for the ability to sense pressure?" and the following answer choices: - DNA - two - UV - 12 - RNA - 8 - Eye - p53 Now knowing that touch is the ability to sense pressure and twelve touch genes are needed for touch cell function, choose the best answer.
12

You are presented with the question "the bones of what can be found to signify that place used to be covered by water?" and the following answer choices: - h2o - living things - dogs - adult sea squirts - bullfrogs - humans - an amoebae - gastropod shells Now knowing that if fossils of a water animal or plant are found in a place then that place used to be covered by water in the past and gastropod Shells of marine animals are often preserved as fossils, choose the best answer.
gastropod shells