The answer would be A. a virus
The question states that the blood was filtered thru a porous material that prevented <u>all cells </u>from passing thru.
All of the options are cells except viruses.
Hope this helps:)
Epiglottis
The epiglotis is what allows you to swallow food without inhaling it. It acts as a gateway between the digestive and respiratory systems
C. Organ System
Like said in the definition above, an organ system is a group of organs working together to perform a specific function for the organism.
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Given what we know, we can confirm that Salt marshes are an example of an ecosystem service.
<h3>What is an ecosystem service?</h3>
This describes situations in ecosystems that are beneficial to human life. This example describes the way in which salt marshes provide humans with a steady and stable source of fish that are important to the fishing industry.
Therefore, we can confirm that the Salt marshes are an example of an ecosystem service.
To learn more about ecosystems visit:
brainly.com/question/1673533?referrer=searchResults
Frontal bone, lacrimal, maxilla, ethnoid, zygomatic and palatine contribute to the formation of the orbit.
Happy Studying! ^=^
