Specific excretory organs are absent in unicellular organisms belonging to the<u> phylum Porifera.</u>
The organisms of the phylum Porifera are classified under the kingdom Animalia and they lack specific organs in their bodies.
The word "Porifera" refers to pore-bearing organisms.
These animals have loosely organized cells and are found in freshwater marine ecosystems.
On their body, a large number of pores - Ostia - are present which perform various functions such as excretion.
However, respiratory gases and waste materials are exchanged through a diffusion process.
Moreover, in them, reproduction takes place through fragmentation and budding.
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The unit rate of the train in miles per hour is; 45 miles per hour
Distance traveled by train; d = 540 miles
Time of travel; t = 12 hours
Unit rate here will be the distance travelled per hour.
Formula for the unit rate here is;
Unit rate = distance travelled/time taken
Unit rate = 540/12
Unit rate = 45 miles per hour
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Flexor digitorum longus muscle
Answer: Discus immune response to a pathogen through the oral (oral-anus) and respiratory route Discus immune response to a pathogen through the oral (oral-anus) and respiratory route Expert Answer The body is resistant to various pathogens through passive and active immunity.
Explanation: Periodontal pathogens may also present differences in their ability to induce immune responses from the host; thus, we evaluated the effects of various oral bacteria on the expression of AMPs and IL-8 by gingival epithelial cells.
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