Question

which statement best explains how blood helps body systems work together? blood allows materials to be transported between systems. blood produces oxygen inside the arteries. blood controls the nervous system directly.

Explanation:

• For the option "Blood produces oxygen inside the arteries": Oxygen is produced in plants during photosynthesis and is taken into the body via the respiratory system, not produced by blood in arteries. So this is incorrect.
• For the option "Blood controls the nervous system directly": The nervous system is controlled by neurons and the brain, and blood does not directly control it. Blood provides nutrients and oxygen to nervous system cells but does not control the system. So this is incorrect.
• For the option "Blood allows materials to be transported between systems": Blood is a transport medium in the circulatory system. It carries oxygen from the respiratory system to other systems, nutrients from the digestive system, hormones from the endocrine system, and also takes waste products to the excretory system. This accurately describes how blood helps different body systems work together by transporting materials between them.

Answer:

A. Blood allows materials to be transported between systems.