Which best explains how the fossil record supports the theory of evolution? a. It provides evidence for how genetic variation in organisms is determined by independent assortment.
b. It explains the impact that humans have had on the evolution of organisms on Earth.
c. It shows how the types and distribution of organisms on Earth have changed over time.
d. It proves that some organisms developed behaviors that helped them to survive.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.