Step 1: Bacteria, through nitrogen fixation and nitrification, convert nitrogen into a usable form.
Step 2: Once nitrogen is in usable form, it is taken up by plants and assimilated into proteins..
Step 3: An animal eats a plant and the nitrogen becomes part of the animal’s proteins.
Step 4: The animal dies and decomposes, returning nitrogen back to the soil.
On edg 2020 -
Evolution can be defined as the process of the change occurring in a population over a period of time through genetic variation. This genetic variation and the process of natural selection help a species to evolve by selecting the traits that helps it to better adapt to the environment. These genetic variations are inherited over time as the species continue to evolve.
Hence, the correct answer is 'change in population through genetic variation over time'.
The statement that best sums up evolution is the change in a population through genetic variation over time. Natural selection may be through (1) differential reproduction, that is, not all organisms are able to reproduce to their fullest capacity because nature cannot simply sustain it and (2) acquire genes, that is heredity.
Lysosomes are the cell organelles that have hydrolytic enzymes. Phagosomes, the vesicles carrying the large solid particles or undigested materials fuse with lysosomes. The hydrolytic enzymes of lysosomes break down the ingested material. The products of the hydrolysis may be released into the cytoplasm.
Alternatively, exocytosis releases the digested materials out of the cells. A secretory vesicle is formed inside the cell that fuses with the plasma membrane and releases its content outside the cell.
A specialized epithelial tissue that lines blood and lymph vessels is known as the endothelium, which is present in Option a. The endothelium lines the blood vessel, and due to the tissue, gas diffusion takes place.
Blood vessels can be found throughout the body, and there are both arteries and veins that serve different organs and tissues. The blood vessels are called the "closed circulatory system" in the human body because the blood travels through the blood vessels. The artery carries the oxygenated blood to the different body parts except the pulmonary artery, which takes the deoxygenated blood from the heart to the lungs.
The veins take the deoxygenated blood from the organs and tissues to the heart, except for the pulmonary veins. It carries the oxygenated blood from the lungs to the heart, and later it gets supplied to different body parts.
Hence, A specialized epithelial tissue that lines blood and lymph vessels is known as the endothelium, which is present in Option a.
Learn more about the blood vessels here.