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Kazeer [188]
2 years ago
8

Pollination by bees and other animals is very important for the production of food for humans. What type of ecosystem service is

pollination and example of?
A. Direct Service
B. Indirect Service
C. Ethical and Aesthetic service


I really need help with the answer. I think it is B but I am not sure!
Biology
1 answer:
Ket [755]2 years ago
6 0
I think the answer is b too!
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Dendritic cells and macrophages kill by ingestion and destruction of particulate matter in a process called phagocytosis. Dendri
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The statement is true

Explanation:

Hematopoietic stem cells give rise to myeloid progenitor and lymphoid progenitor and these two progenitors give rise to many immune cells. Dendritic cells are produced by both the progenitors and macrophages are produced by myeloid progenitor.

Both macrophages and dendritic cells are phagocytes. In phagocytosis, the foreing particles are injected by these phagocytes and they are destryoyed by the action of digestive enzymes present in these phagocytic cells.  

Macrophages are present in tissue and if they are present in blood they are called monocytes. Therefore the statement is true.

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5 0
3 years ago
Testing Two-Point Discrimination
yanalaym [24]
Two-point discrimination is the minimal distance which someone can perceive two different stimuli that given simultaneously. An area with higher receptor density will have a lower two-point discrimination result since the distance between receptor is lower. 
The area that needs a high sensitivity like the palm of the <span>hands(especially the fingertips), face</span>, and tongue should be the one with lowest two-point discrimination.

In this report, a<span>nterior forearm two-point discrimination result is the lower than the fingertip. This result is suspicious since the forearm shouldn't more sensitive than the fingertip. Fingertip two-point discrimination is around 2-6mm and forearm should be much higher than 6mm.
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8 0
3 years ago
Scientists calculated the net primary productivity at two different forest sites. Both forests have the same gross primary produ
Katen [24]

Answer:

The answer is C.

Explanation:

Net Primary Productivity is a term that is used to express the difference between CO2 that is taken in by the plant with photosynthesis minus CO2 that the plant releases.

The two forest sites given in the example may not have the same biodiversity and the same species of plants so we can't be sure of option B.

Again for the same reasons, we can't be sure of option D because we do not know the specific plant species in each forest since they are in different areas.

Option A can be ruled out for the same reasons, the lack of information about the forest sites, since we do not know the death rate of the plants in either of the forests.

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I hope this answer helps.

4 0
3 years ago
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