Most communicable diseases are either bacterial or viral and infect the respiratory tract.
Communicable, or infectious diseases, are generated by microorganisms such as parasites, fungi, bacteria, and viruses, which can be spread, directly or indirectly, from one person to person.
A majority of upper respiratory diseases are due to self-limited viral epidemics. Occasionally, bacterial germs may produce upper respiratory infections. Most often, upper respiratory virus is communicable and can spread from person to person by breathing respiratory droplets from coughing or sneezing.
All living organisms are composed of microscopic building blocks called cells, which are the structural and functional unit of life because this cell has many organelles and genetic materials that carry out different cellular functions.
The cell is the structural and functional unit of life, and it is microscopic in size. Cells join together to form tissue, and tissue joins together to form organs, which perform various functions in the multicellular organism.
The cell contains organelles such as the nucleus, which contains genetic components such as DNA. Genes that encode genetic information are present on the DNA, and depending on the gene, the cell does its function. The cell regulates both unicellular and multicellular organisms, maintains homeostasis, performs different functions, etc.
Hence, all living organisms are composed of microscopic building blocks called cells, which are the structural and functional units of life and consist of geneticmaterials.
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large hypertonic vacuole
no chlorophyll or chloroplasts
cell plate in cell division
cleavage furrow
Answer:
no cell wall, only plasma membrane
cleavage furrow
Explanation:
The animal cells are different from the plant cells in many ways. The specific characteristic features of the animal cell include the absence of the cell wall, and the formation of the cleavage furrow during the cell division.
The animal cells only have plasma membrane around them. No large hypertonic vacuole is present. The chlorophyll and chloroplasts are present in the plant cells and not in the animal cells. The cell plate is formed in the plant cells during the cell division. In the animals, a cleavage furrow is formed instead of the cell plate.
cell division and differentiation, and the role of specialized cells in complex organisms, such as humans.
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The stems cells make new cells by the process of cell division and the new cells continuous to divide and continue to grow and specialize into new cells that tends to replace themselves.
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Stem cell division is the process of mitosis that produces two identical daughter cells, which can then either remain as stem cells or differentiate into specialized cells. Specialized cells have specific functions in complex organisms.
In stem cell division, stem cells undergo the process of mitosis to produce two identical daughter cells. These daughter cells can either remain as stem cells or differentiate into different types of specialized cells. Stem cell differentiation is the process by which stem cells develop into distinct cell types with specific functions. In complex organisms like humans, specialized cells play crucial roles in various physiological processes, such as carrying oxygen in red blood cells or transmitting signals in nerve cells.
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