The atria are the chambers of the heart that receive blood into the heart. 

Cardiac muscle cells are rich in mitochondria.

The right atrioventricular valve opens for blood to flow from the right atrium to the left ventricle. 

Choose the correct option to correctly complete the sentence:  An adverb clause should always start with a word such as ‘if’ , ‘because’ , ‘before’…etc. This word is called : 

Choose the correct option to correctly complete the sentence:  The following is NOT a subordinating conjunction:

Identify and choose the complete adverb clause: We had to wait in the lobby until a room was available. 

Identify and choose the complete adverb clause: Since it was foggy in the morning, it was very difficult to drive. 

Choose the correct option to correctly complete the sentence:  An adverb clause clarifies and gives extra details and information about the ________ in the main/independent clause. 

Which one of the quantities below has dimensions equal to MLT2?

A cannon of mass 1.50×103 kg fires a 10.00 kg shell with a velocity 200.0 ms at an angle of 45.0° above the horizontal. Find the recoil velocity of the cannon across the level ground.