Answer:
This question lacks options, options are:
A) pathogen.
B) keystone species.
C) herbivore.
D) resource partitioner.
E) mutualistic organism.
The correct answer is B)
Explanation:
Keystone species are considered to be those whose activity generates an effect on other species in the community that considerably exceeds that expected according to their biomass or abundance, that is, the most connected species from a trophic point of view in an ecosystem are keystone species, given that its elimination has great effects on the stability and persistence of the network. Many times the absence of keystone species makes it difficult to conserve the community.
The answer is (b.) Fine Pebbles have a higher threshold velocity than sand.
Given the fact that fine pebbles' diameter size are usually 2.0 to 5.0 mm which is bigger compared to sands which diameter is usually measure only at 0.05 to 2.0 mm, thus fine pebbles have higher threshold velocity than sand. In Geophysics, threshold velocity refers to the minimum velocity of a particle such as pebbles and sand to move by the cause of wind or water. Therefore, the higher threshold velocity is the fine pebble since it is bigger.
The solution that is used as a preservative for a blood sample is a solution of 0.1 mg sodium citrate plus 0.1 mg mercuric chloride. Option A
<h3>How is blood preserved?</h3>
Many times, it is important to transport a blood sample from one point to another. In such cases, it becomes important to add a preservative to the blood sample so that it does not coagulate.
The solution that is used as a preservative for a blood sample is a solution of 0.1 mg sodium citrate plus 0.1 mg mercuric chloride. Option A
Learn more about preservative for blood sample:brainly.com/question/13739588
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Huddling is the correct awnser
