Answer and Explanation: When Sedimentary rocks are heated with lot's of heat and pressure, they will melt and be back again to magma. After a while it would cool and also get harden and will become Igneous rocks.
Answer: Possession of Valves
Explanation: Veins possess valves which ensures that blood flows in only one direction. Valves helps blood to flow back to the heart against gravitational force.
Arteries don't have valves because the pressure originating from the heart is capable of causing the blood to flow in one direction.
<span>Most children acquire a firm sense of gender identity by the age of three</span>
Answer:
the answer is probability
Explanation:
Answer:
By using specialized external systems.
Explanation:
To maintain homeostasis, unicellular organisms grow, respond to the environment, transform energy, and reproduce.
