<span>Yes, if the photo receptor cells and simple eyes that preceded it were useful to the animals in which they arose.</span>
Answer: Active transport
Explanation: Active transport is a process of transferring materials with the expenditure of energy
Answer:
Heart attack
Explanation:
Heart attack is the death of a part of heart muscles and severe pain that causes heart constriction having pain in the chest which spread to the left shoulder and down the arm thereby causing the feeling of pressure in the chest.
This is caused when a blood clots blocks blood flow to the heart thereby leading makes the tissue to loss oxygen and die.
The symptom of heart attack are;
pain in the chest, neck, back or arms, fatigue, lightheadedness, abnormal heartbeat and anxiety, nausea.
Treatment ranges from surgery, medication , rehabilitation e.t.c.
Answer:
all cells reproduce through photosynthesis
Explanation:
Answer:
Explanation:
The ball-and-stick model cannot show the actual size of the atoms depicted in the model. You also cannot see the actual bond lengths between the atoms.
