food storage; deciduous.
b. a fish's tail fin.
c. a dog's front legs.
d. a mosquito's wings.
A bird's wings are homologous to a dog's front legs. Thus option C is correct.
Homologous structures shows the same structure, but may have a different function or same function.
Homologous structures have a common ancestor, this structure is an organ or bone that's in common between different animals that demonstrates an anatomical structure indicating that the animals share a common ancestor.
This is in contrast to analogous structures where two unrelated animals have structures with similar forms or functions due to convergent evolution.
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can flow
is composed of moving particles
cannot be compressed
Answer: Immigration can be a reason for a overall increase in the population of a species. It is a method by which the species at other place migrate to a different place permanently. The reason to migrate to a different area can be lack of resources, hunting, or any natural calamities. The population of a particular geographical area shifts to another area only because of the problems that does not allows the population to reside there. This makes the population move to another area for their survival.
D. The immigration of the population is greater than the emigration.
The answer is; The closer two genes are on a chromosome, the lower the probability that a crossover will occur between them
The closer together two genes are on a chromosome, the higher the likelihood that they will be inherited together. This is referred to as genetic linkage. The higher the genetic linkage the lower the recombination frequency of the two genes.
The statement that 'The closer two genes are on a chromosome, the lower the probability that a crossover will occur between them' is true regarding linkage. This is because genes close together are less likely to be separated during crossover in meiosis. Other statements provided about linkage are typically incorrect.
In the context of genetics, linkage refers to the phenomenon where genes that are located nearby each other on the same chromosome tend to be inherited together. Therefore, the correct statement regarding linkage from the provided options is:
The closer two genes are on a chromosome, the lower the probability that a crossover will occur between them.
This is because when genes are close together, they are less likely to be separated during crossover, a process that occurs during meiosis.
Note that not all traits that Mendel studied are due to genes linked on the same chromosome. Most genes are in fact not linked - they can independently assort during meiosis. Equally, linked genes are not found on different chromosomes, they are on the same one.
Lastly, the recombination frequency for two genes that are far apart from each other doesn't have a maximum of 100%. It typically peaks around 50%, which is an indication that the genes behave as if they are independently assorting.
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Ans.
Coral reefs are underwater ecosystems, made from growth and deposition of living or dead corals. Red algae play an important role in formation of coral reefs. The thread-like structures of red algae trap the sand sediments and particles of sands and cements, which provide mechanical support to the colony of corals and help them to grow.
Thus, the correct answer is option). 'red.'
What kind of transport is occurring?
Salivary glands create saliva and secrete saliva. Acini, which are collections of cells, are the primary secretory components of salivary glands.
The largest salivary glands, the parotid glands, which are located between the rear of the jaw and each ear, release around 25% of the total volume of saliva when at rest.
The parotid capsule, a tough capsule that encases each gland, is present. Saliva from the parotid is typically watery or serous.
Large amounts of bicarbonate ions are secreted, potassium is secreted, and a significant portion of sodium is actively reabsorbed.
Salivary glands include small collecting ducts that branch out into larger ducts until they unite into one giant duct that exits into the mouth cavity.
Therefore, salivary gland cells produce the enzyme salivary amylase and secrete it into the salivary ducts.
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Answer:
Saliva is produced in and secreted from salivary glands. The basic secretory units of salivary glands are clusters of cells called an acini. These cells secrete a fluid that contains water, electrolytes, mucus and enzymes, all of which flow out of the acinus into collecting ducts. Within the ducts, the composition of the secretion is altered. Much of the sodium is actively reabsorbed, potassium is secreted, and large quantities of bicarbonate ion are secreted. Bicarbonate secretion is of tremendous importance to ruminants because it, along with phosphate, provides a critical buffer that neutralizes the massive quantities of acid produced in the forestomach's. Small collecting ducts within salivary glands lead into larger ducts, eventually forming a single large duct that empties into the oral cavity.
Explanation: