Based on the organization of living things, how could we classify the pollen produced by this flower?

A) an organ that is part of a system
B) a group of cells that form an organ
C) begins as a cell and is part of a system without organs
D) begins as a cell, comes from an organ, is part of a system

D) begins as a cell, comes from an organ, is part of a system

Explanation:

Here is how pollen is formed, in simpler words, it comes from sporogenic tissue, formed inside the male organ called the anther, and is part of the male reproductive system.

The formation of a pollen grain begins inside the male part of a flower called the anther, within specific tissue called sporogenic tissue. Here, the developing pollen receives nutrition and a coat of cellulose, which is a very strong plant protein. First, large pollen mother cells are produced, which eventually break into individual pollen grains through cell division. At this point, the pollen grain gets its outer coat, called the exine, which is made from another tough plant protein. The exine protects the delicate genetic material inside the pollen grain from water loss, and damage caused by UV radiation and other environmental causes. In some plants, the pollen grain also gets a sticky outer layer to help it adhere to the female part of another plant, called the stigma. The final step involves another cell division, which creates two cells within one pollen grain. After that, the pollen grains move to a drying-out phase, after which they take on their dusty appearance and are ready to go out into the world and fertilize ovules.

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."