1. Portion of action potential when inside of plasma membrane is returning to resting membrane potential, becoming more negative 6. Acetylcholine binds to -gated ion channels 7. Ability of muscle to recoil to original resting length after stretched 9. Mature cartilage cell 11. Smooth muscle is controlled by this branch of the peripheral nervous system 13. Basic functional unit of muscle contraction; From Z disk to Z disk 14. Type of muscle fatigue resulting from emotional state of an individual 17. Inflammation of fibrous connective tissue following prolonged skeletal muscle tension 19. Protein covering active sites on actin during state of muscle relaxation 21. Decrease in muscle size over time 22. Type of bone formation resulting from calcification of cartilaginous tissue 23. Muscle fiber type that responds rapidly to nervous stimulation; rapid breakdown of ATP; few mitochondria 24. A state of muscle contraction when the tension of muscle fibers change while maintaining consistent length

hello

answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.