Nelly was reading about ecological pesticides. she found a website that said that skeletons of some organisms settle as sediments in the ocean. they are then used as pesticides because they are abrasive against pests. which organism is the article discussing?

dinoflagellates
diatoms
green algae
euglenoids
amoeba

The correct answer is option (B) diatoms.

Diatoms are the photosynthetic, single celled algae found in oceans with a characteristic skeleton made up of the silica having a huge fossil deposits. These fossilized remains of the diatoms are called diatomaceous earth or diatomite. This siliceous sedimentary rocks of diatoms are converted to a powdery mass and used for many purposes.

The Diatomite is widely used as an insecticide. It is used against members of arthropods like insects, molluscs like slugs. In the members of arthropods, the diatomite powder absorbs the lipids from the exoskeleton of the organisms making it vulnerable to the evaporation of water or water loss from the body. It is also used in the control of ants, cockroaches, mites, bed bugs, bettles and other organisms. It can also reduce the fleas and parasites on other animals.

prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.