Answer:
Excuse me, but there is no picture.
Explanation:
In two species of birds, both of which form monogamous pair(one male and one female), In species 1, you find that the eggs in a pair's nest are in fact almost always the offspring of that pair. In species 2, you are surprised to find that many of the eggs in a nest were actually fathered by males of neighboring pairs. Apparently, mating outside of monogamous pairings is widespread in species 2. we would expect that female of species 2 would have sperm from multiple males in their reproductive tracts.
- This is because the species 2 are having many eggs.
- These eggs were formed due to fertilization with multiple male bird partners.
- As a result we can expect eggs with different genotypes.
Thus from the above points we can conclude that two species of birds, both of which form monogamous pairs, female of species 2 would have sperm from multiple males in their reproductive tracts
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One example: The improvement in science and technology over the years has decreased the infant mortality rate. Since more babies live, we have a higher population.
Also, with increases in science and technology, there are many diseases that were once considered fatal that are now easily treated. This has also led to a higher population.
Answer: Microtubules
Explanation:
The cytoskeleton is a three-dimensional network of proteins that provides internal support in the cells, organizes the internal structures and intervenes in the phenomena of transport, traffic and cell division. In eukaryotic cells, it consists of actin filaments, intermediate filaments and microtubules.
<u>The microfilaments maintain the shape of the cell.</u> Other functions are the formation of cytoplasmic protuberances such as pseudo and microvilli, participating in intercellular or cell-matrix junctions, signal transduction, cell mobility (in the case of muscle cells, and together with myosin, they allow muscle contraction) and in animal cell cytokinesis, the formation of a contractile ring that divides the cell in two.
<u>Intermediate filaments are fibrous protein filaments which constitute the most stable (supporting organelles by their strong bonds) and heterogeneous components of the cytoskeleton.</u> Their main function is to organize the internal three-dimensional structure of the cell (for example, they are part of the nuclear envelope and the sarcomers). They also participate in some intercellular junctions (desmosomes).
<u>Microtubules are tubular structures that originate in microtubule organizing centers and extend along the cytoplasm. They can be polymerized and depolymerized according to the needs of the cell</u>. They are found in eukaryotic cells and are formed by the polymerization of a dimer of two globular proteins, alpha and beta tubulins. Each microtubule is composed of 13 protofilaments formed by the tubulin dimers. <u>They are involved in various cellular processes involving displacement of secretion vesicles, movement of organelles, intracellular transport of substances, as well as in cell division (mitosis and meiosis), since they form the achromatic spindle. In addition, they constitute the internal structure of cilia and flagella. </u>
Microtubules are composed of a protein called tubulin and they are the largest type of filament and its diameter is about 25 nanometers (nm). While actin filaments are made of actin and they are smaller, with a diameter of about 6 nm. And intermediate filaments have a diameter of about 10 nm, which is intermediate between the diameters of the two other principal elements of the cytoskeleton.
In the northeastern United States, estuaries are most likely to experience environmental threats from commercial development and tides.
<h3>What is Estuary?</h3>
This consists of brackish water which is partially closed and have rivers or streams flowing into it.
In Northeastern United States, estuaries experience environment threats as a result of high tides which degrades it and also commercial development in the area.
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