Large muscles grow before small muscles grow.
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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Answer:
The absence of estrogen may lead to many symptoms:
- Irregular periods
- Anovulation, and therefore, infertility
- Hot flashes
- Decreased vaginal lubrication, which can lead to painful intercourse
- Depression, because estrogen stimulates serotonin release
- Osteoporosis and bone fractures
- Weight gain
Usually the treatment for low estrogen levels is hormone replacement therapy (orally, vaginally or topically)
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