Answer:
advances in optics leading to the develupment of the hubble telloscope
Explanation:
i took the test hope this helps
The best answer is A.
As soon as the blood vessel wall is broken or damaged, a series of reactions activate platelets so that they stick to the site of injury. The platelets are able to hold to the blood vessel wall by means of a protein substance called von Willebrand's factor.
Collagen and thrombin then act at the site of injury and induce platelets to clump or stick together, forming a mesh that plugs the broken part. Special clotting protein help sequester more platelets to the plug which finally becomes a blood clot.
a low red blood count can cause feeling of fatigue and weakness.
Answer:
Mosquitos, roundworms and ticks.
Explanation:
The repressor would no longer be able to bound back to DNA