Why do scientists divide Earth's core into and outer core and inner core? Group of answer choices

They exist in different states of matter.

They have a different chemical composition.

They were formed in different geological eras.

They are divided by a layer of partly molten material called the mesosphere.

Select the correct answer.which scenario describes unethical lab behavior? o a. danny stores the chemicals required for his experiment in flasks and beakers.b.anna publishes the results of her experiment on the growth rate of saplings.c.jason repeatedly runs an experiment until he gets the results he desires.d. mia records her observations of an experiment precisely and accurately.

When water freezes, it . contracts expands

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