Answer:
This type of experimentation is most common in Tertiary Circular Reactions of Piaget’s stages of sensorimotor intelligence.
Explanation:
Tertiary Circular Reactions: this is the stage where a child begins an trail by error experiment with things that are around him.
I think the answer is C im not a 100% sure glad i could help you tho
Answer:
D) four.
Explanation:
The two atria hold the blood that circulates away from the heart. The heart has four one-way valves, which open and close with each heartbeat. The tricuspid valve and the mitral valve are located between the atria and allow the blood to flow from the atria to the ventricles. Also you don't have to but mind marking Brainliest?
The second trimester is when the respiratory system is mature.
If I’m interpreting this correct and you want examples of lung disease there are many including :
Asthma
Bronchitis
Emphysema