<h3>Earthworms are extremely beneficial in agriculture. They aid in the following ways:</h3>
- They help loosen up and aerate the soil as they burrow deep. This aids in the respiration of the roots of the plants, making them penetrate deeper and grow well
- They are being used presently in vermiculture to produce high-quality manure
- They are also used as baits to catch fish
- They keep interchanging the topsoil with the layer just below, thereby increasing soil fertility.
- The excreta of earthworms is rich in the nitrogenous matter and is required for plant growth
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Answer: The correct answer for the blank is-
A) mitosis; meiosis
Mitosis is a type of cell division in which a parent cell produces two daughter cells with equal number of chromosomes as that of parent cell. It is essential in repair of damaged tissue and growth of living organisms. This is because body cells produce additional body cells with same genetic material.
Meiosis is another type of cell division that is specific to the sexually reproducing organisms. It is a reductional division as the diploid parent cell produces four haploid, reproductive cells ( called gametes such as eggs and sperms). This means that gamete formation in sexually reproducing organisms occurs through meiosis.
Thus, option A) is the right answer.
Fish fossils occur in sediments deposited underwater. That could be sea bottom, lakes, or rivers. Generally, seabottom sediments are raised to the surface by tectonic uplift. Also, when sea level falls during ice ages, sea bottom sediments are exposed to the atmosphere.
Ribosome. thats the protein cell where synthesis takes place
Answer:
The levels, from smallest to largest, are: molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere.
