Plz help me ASAP with this test question Hemostasis is the natural process that stops blood loss when an injury occurs. it involves three steps: (1) vascular spasm or vasoconstriction : (2) platelet plug formation and 3) coagulation . The platelet plug forms almost directly after a blood vessel has been ruptured. Within twenty seconds of an injury in which the blood vessel's epithelial wall is disrupted, coagulation is initiated and it takes only about sixty seconds until the first fibrin strands begin to intersperse among the wound. What step * (s) must be taken at the wound site for this plug formation to be initiated?

A. The clotting of a skin injury is caused by exposure to air, specifically oxygen, that activates platelet production.

B. Endothelial cells at the wound site stop secreting coagulation and aggregation inhibitors heparin and thrombomodulin

C. Clotting factors take part in a cascade of chemical reactions that eventually create a mesh of fibrin within the blood.

D. Thrombin is released to facilitate the conversion of the plasma protein called fibrinogen into long, insoluble fibers of the protein, fibrin

In 1959, doctors began using the powerful antibiotic methicillin to treat infections of staphylococcus aureus, but within two years, methicillin-resistant strains of s. aureus (mrsa) appeared. how did the resistant strains of s. aureus emerge? in 1959, doctors began using the powerful antibiotic methicillin to treat infections of staphylococcus aureus, but within two years, methicillin-resistant strains of s. aureus (mrsa) appeared. how did the resistant strains of s. aureus emerge? staphylococcus aureus bacteria that were able to synthesize cell walls using a protein that was not affected by methicillin survived the methicillin treatments and reproduced at higher rates than did other individuals. over time, these resistant individuals became increasingly common. in response to treatment of staphylococcus aureus infections with methicillin, some bacteria began to synthesize cell walls using a protein that was not affected by methicillin. these bacteria survived the methicillin treatments and reproduced at higher rates than did other individuals. over time, these resistant individuals became increasingly common. in response to treatment of staphylococcus aureus infections with methicillin, bacterial populations gradually began to synthesize cell walls using a protein that was not affected by methicillin.

Q: a: in sexually reproducing animals, once fertilization of the egg takes place, the exists as a single cell until cell division begins

Explain why the plants cortex would serve as the best food source for animals