During a discussion of body systems..which one is true? F. Bone in the skeletal system contain bone marrow that mkaes white blood cells as part of the integumentary system.
G. Bones in the skeletal system work with muscles in the lympathic system to help you run.
H. Bones in the skeletal system help protect the lung organs in the respiratory system to exchange carbon dioxide for oxygen.
J. bones in the skeletal system store calcium that is used by reproductive system for communication.

F should be the correct answer because that one say bones have bone marrow which is true and they make white blood cells

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this