Answer:
The missing step is oxygen is removed from the water after step 3.
Explanation:
The steps listed by Xavier are:
- <em>Water is drawn in trough pores and enters the central cavity.
</em>
- <em>Food is filtered and digested.
</em>
- <em>Water leaves trough an opening at the top of the body.</em>
Porifera or sponges are aquatic, immobile invertebrates whose structure is saccular with an upper opening, the osculus.
Sponges absorb water through their pores, where the porocytes are found, and through flagellated cells -the coanocytes- the movement that allows the entrance of water to the spongocele or atrium is produced, in addition to the phagocytosis of organic elements.
Once the water is in the interior chamber of the sponges, the organic particles are phagocyted to be digested, and the oxygen is removed from the water, and passes through diffusion into the cell. The waste products, as well as carbon dioxide, are released into the water that will be expelled through the osculus.
<u><em>In Xavier's list, the missing step is the removal of oxygen from the water, before it is expelled from the body of the sponge</em></u><em>.</em>
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Learn more:
Sponge structure brainly.com/question/11256747
Answer:
The correct answer is -
1. right-handed
2. right-handed
3. positive
4. left-handed
5. negative
6. negative
Explanation:
In a circular bacterial chromosome, the structure of DNA is a right-handed double helix In a circular bacterial chromosome.
If DNA is twisted in the right-handed direction, it becomes overwound. Overwinding results in positive supercoiling takes place. If DNA is twisted in the left handd direction, it becomes underwound. Underwinding results in negative supercoiling.
f. One effect negative supercoiling in bacterial chromosomes is to promote separation of the two strands of DNA in the double helix
It's a fundamental law of how the universe organized.
Answer:
c sorry if u get it wrong
