The___ is critical in the cell cycle because it indicates the cell is ready for division.

A spectacular marine animal has a network of glassy spicules that forms a sac-like structure. This animal does not have true tis

PolarNik [594]

Answer:

Sponges use choanocytes or flagellated channels to get nutrients from the feeding cells to other parts of their body.

Explanation:

Sponges are marine animals with a sac-shaped body. The epidermis is composed of polygonal flat cells called pinacocytes and pores protected by porocytes. Under the epidermis, there is a protein matrix called mesenchyme, which is composed of spicules and amibocytes. By the interior side of the sponge, there are the choanocytes. These are ovoid cells that can be shaping the spongocoele (internal cavity of the sponge), with an extreme attached to the mesenchyme and the other extreme projected to the spongocoele, or can be grouped in spaces called flagellated channels.

These animals depend on water to get oxygen and food to the inside of the sac and take excrements and reproductive cells to the outside. Sponges feed on small detritus particles and suspending organisms that get near the animal by water streams produced by choanocytes.

Particle size is essential. Only the small ones can get through the flagellated channels, where they get stuck to the choanocytes and are encapsulated by the cells. If the choanocytes are too small, the particle is transferred to the amibocytes for digestion. These last ones also act as food storages. Excrement products are dragged by a water stream.

5 0

2 years ago

How does hemoglobin act as a buffer?

dem82 [27]

It has the ability to bind itself to small amounts of acid in the blood, which helps with removing that acid before the blood’s pH changes

4 0

3 years ago

How is osmosis difrent from diffusan

bulgar [2K]

Osmosis is the phenomenon of the movement of Solvent molecules from lower solute conc. to higher solute conc. through a semi-permeable membrane to make solute conc. equal on both sides.

7 0

2 years ago

In men, the gene for baldness acts as a dominant gene and in women it acts as a recessive gene. A bald man who father was not ba

gogolik [260]

So: both parents' genotypes (concerning baldness gene) are the same: Bb. Possible genotypes of an offspring: BB, Bb, Bb, bb . bb means non-bald girl or boy. Bb means bald boy or non-bald girl. BB means bald boy or girl. there is 25% chance of conceiving a child with a genotype BB. But there is also 50% chance of conceiving a girl. So the answer is: 25% x 50% = 12,5%

5 0

3 years ago

What does the Miller-Urey experiment tell us about the origin of life?

aivan3 [116]

Answer:

B inorganic materials can form organic molecules under the right conditions

7 0

2 years ago