Clotting begins when a occurs in a blood vessel wall. Almost immediately, cling to the blood vessel wall and release , which helps to decrease blood loss by constricting the vessel. is also released by damaged cells in the area. This chemical substance causes to be converted to . Once present, thrombin acts as an enzyme to atatch molecules together to form long, threadlike strands of , which then traps flowing by in the blood.

Options

1. FIBRINOGEN
2. SEROTONIN
3. PROTHROMBIN
4. BREAK
5. FIBRIN
6. THROMBOPLASTIN
7. ERYTHROCYTES
8. PLATELETS
9. THROMBIN

a and b

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.

there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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explanation: