Answer:
D. Activated platelets release chemicals that activate more platelets.
Explanation:
When a stimulus or a change in some condition triggers a response that intensifies the changing condition, the mechanism is called a positive feedback mechanism.
Any damage to tissues makes the platelets to contact and stick to parts such as collagen fibers of the connective tissue present under the damaged endothelial cells. This process of platelet adhesion activates the platelets and brings about changes in them. The activated platelets grow many projections to contact and interact with one another. They also release ADP and thromboxane A2 which in turn activates the nearby platelets. The ADP makes other platelets in the area sticky. The stickiness of the newly recruited and activated platelets causes them to join the originally activated platelets. Eventually, the accumulation and attachment of large numbers of platelets form a platelet plug.
Here, release of chemicals from the activated platlets to activate more platlets represents the positive feedback mechanism.
Answer:
I believe the answer is C. Doldrums.
Explanation:
Hope my answer has helped you and if not i'm sorry.
Answer:
The correct answer will be option- 1.5 million.
Explanation:
Biodiversity refers to the variety of species and ecosystem present on the earth in which they are part of it. The biodiversity comprises of three components: species diversity, ecosystem and genetic diversity.
The number of species present on this planet is found to be around 1.5 million in which 17,000 new species are being added to the existing number.
Thus, option- 1.5 million is the correct answer.
Seasonal changes in carbon dioxide concentration with the highest levels measured in May and the lowest levels measured in October will affect the photosynthesis rate due it is a reactant which is required during photosynthesis.
<h3>What are the photosynthetic chemical reactants?</h3>
Photosynthetic chemical reactants are those materials required to carry out photosynthetic reactions which include carbon dioxide and water molecules. These materials are used to generate simple carbohydrates such as glucose and oxygen.
Photosynthesis also requires sunlight to excite the electrons of chlorophyll molecules in order to generate chemical energy (glucose)
Therefore, with this data, we can see that the photosynthetic chemical reactants include both carbon dioxide and water, thereby fluctuations in the levels of these materials will affect the photosynthesis rate and thus may lead to a decrease and or an increase in the amount of photosynthetic products (i.e. oxygen and also glucose).
Learn more about the photosynthetic chemical reactants here:
brainly.com/question/12519864
#SPJ1
The fish would not be able to live their because the could not find food and it would be too shallow in certain areas
