Idon't understand most of this after question #2, plz

Athermometer is placed in water in order to measure the water’s temperature. what would cause the liquid in the thermometer to rise?

Ascientist discovers a new body between the orbit of neptune and the kuiper belt. the object is round and travels in an orbit around neptune with other space objects. the scientist claims that she has found a new dwarf planet. where is the scientist’s error?

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