Answer:
all matter has mass
Explanation:
to be considered matter it must have mass and take up space
Answer:
yeah humans are considered creatures by other creatures
Explanation:
If you think aliens are abnormal just think that aliens think we're also aliens
or some new creature
Answer: D) Pulmonary and aortic valves.
Explanation
There are two main heartbeats from a healthy heart.
The first beat is called the S1 or the lub, and it occurs when the atrioventricular valves (comprising the mitral and tricuspid valves) close.
The second beat is called the S2 or the dub, and it occurs when the semilunar valves (comprising the aortic and pulmonary valves) close.
Listening for heart beats is an essential part of cardiac auscultation.
the answer is C or the third one down, Layer A is the outer core because its made of iron and nickel
I think it A because Cyanobacteria absorb co2 from the atmosphere and then release oxygen To the atmosphere
