A light microscope that makes the specimen appear light on a dark background is called a(n) _____. compound microscope electron microscope dark-field microscope

Answer:

This is known as latent learning: learning that occurs but is not observable in behavior until there is a reason to demonstrate it. Latent learning also occurs in humans.

Explanation:

The right answer is D. Latent Learning. This type of learning is not visible or expressed by the person until a reinforcement occurs that drives the person to do what they have learned. For example, a young man makes a sandcastle when they go to the beach, when they ask him how he learned to remember that it was through a television program he saw years ago.

Answer:

A. Sensory cells and sensory neurons have electrically excitable membranes that change in charge potential in response to binding an environmental signaling molecule

B. Sensory cells and sensory neurons have protein receptors linked to intracellular or membrane-based signaling pathways that alter ion channel permeability.

Explanation:

Neurons have ability to change the charge potential across their membrane in response to certain stimulus or binding of signaling molecule. To allow the binding of signaling molecules, these neurons have receptors on their surface. The binding of signaling molecules affects the charge potential by affecting the permeability of ion channels. Hence, presence of receptors and ability of changing the ion concentration and thereby charge across their membrane allow the sensory cell and neuron to sense the stimulus.

This enables homeostatic regulation. It allows the cells to regulate, in real time, the amount of a particular protein at a particular time period. Different proteins are useful in different biological pathways and their amounts in the body are significant in determining the progress of these pathways.An example of such protein is insulin responsible for regulating blood sugar levels

Keratinocytes help protect the skin from UV damage by accumulating melanin granules, which forms a UV-blocking layer. The balance of melanin production is vital for protecting the skin's DNA while also maintaining proper levels of nutrients like folic acid and vitamin D.

Melanocytes and keratinocytes work together in protecting the skin from UV damage when keratinocytes accumulate the melanin granules on their superficial portion, forming a UV-blocking pigment layer. Melanocytes are responsible for producing melanin, the pigment that gives color to the skin and helps protect it from UV radiation. Keratinocytes, the predominant cells in the epidermis, receive melanin from melanocytes and then move it to their superficial (upper) layers. There, the accumulated melanin forms a protective layer that absorbs and scatters UV radiation, preventing it from reaching deeper layers of the skin. This process is a crucial mechanism in the skin's defense against the harmful effects of UV radiation, including sunburn and the risk of skin cancer.

Out of the following given choices;

A. PR interval would be smaller

B. QRS interval would be shorter

C. There would be more P waves than QRS complexes

D. There would be more QRS complexes than P waves

E. The T wave would be absent

The answer is C. Waves on the ECG represent the depolarization an repolarization of the atrial and ventricular walls. The sequence of waves on the ECG is P waves, QRS complex, then T waves. Therefore, If there is a blockage between the av node and the av bundle, P waves of atrial contraction are of longer intervals (more than 200 ms)compared to those of QRS complex of ventricular contraction. This is referred to as the First Degree Heart Block. In second-degree heart block, no QRS complex follows the P waves

Answer:

C: He showed that planets moved in elliptical orbits.

Explanation:

Copernicus described the solar system model with Sun at its center and planets along with their moons revolving about the Sun in circular orbits. This model is known as heliocentric model and this shift from geocentric model is known as Copernican revolution. Kepler supported the heliocentric model but showed that the planets revolved in elliptical orbits with the Sun at one of its foci. He wrote laws describing the planetary motion.

Answer:

Hello friend the answer is C.

Explanation:

I do K12 so this would help you a lot for the ones who are in K12. :)

Answer: heavy eroded particles settle out of moving water

Placer deposits forms when rocks weathered due to the effect of water. The heavy minerals from the rocks get settled down in water. Minerals that form placer deposits  have high specific gravity, they are resistant to chemical weathering process and are durable.

Placer deposits form when (D) organic matter is compressed over millions of years.

Further Explanation:

During the sedimentaryprocess when the heavy and valuable minerals accumulate, placer deposits/ placer is formed. These are found in the mountain streams. Placer deposits are usually associated with precious metal mining like gold. Sedimentation is the process of settling down of the particles in a medium according to their size.

In the presence of gravity sedimentation occurs. The larger particles have more gravitational force that pulls them down followed by the lighter ones. When the heavy and stable minerals are introduced to weathering, the particles get eroded and flow down through a stream. Because of the heaviness, the metals then settle down at some place and this phenomenon results in the formation of placer deposits.

Placer deposits are usually used in economic geology because metals of high specific gravity which settle down and are concentrated over time are used for valuable purposes.The few varieties of the so-called placer deposits would include: stream or alluvial placer deposits; beach placer deposits; eluvial placers; and eolian placer deposits. Stream or alluvial deposits are so far the most significant placer deposits because these have yielded the most placer gold, cassiterite, platinum, and gemstones. Placer deposits can demonstrate to be truly significant because of a similar reason of high measures of important metals found there.

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AnswerDetails:

Grade:Middle School

Subject:Biology

Chapter:Types of Soils

Keywords:

Sedimentary process, heavy metals, sedimentation, minerals, minerals accumulation, gravity, gravitational pull, placer deposits, economic geology, high specific gravity.

Answer:

The answer is Oxygen

Final answer:

The large intestine begins with the cecum followed by the ascending, transverse, descending, and sigmoid colons, rectum, and ends at the anus, responsible for absorbing water, forming feces, and defecation.

Explanation:

From the end of the small intestine, specifically the ileum, the segments of the large intestine, in order, are as follows: the cecum, ascending colon, transverse colon, descending colon, sigmoid colon, rectum, and anus. The ileocecal valve, located between the ileum and the large intestine, regulates the movement of chyme into the large intestine. Once in the large intestine, the digestion process continues with the absorption of water and nutrients, the breaking down of carbohydrate residues by bacterial flora, and the synthesis of certain vitamins. The goblet cells within the mucosa of the large intestine secrete mucus, easing the passage of feces.

The large intestine's function is to absorb water and form feces in preparation for defecation, and its various sections each play a role in this process. The cecum is the first part where chyme enters, followed by the ascending, transverse, and descending colons, the sigmoid colon, and ultimately the rectum. The rectum serves as storage for feces before elimination occurs, ending with the anus, where feces are expelled.

Answer: The right answer is -

A) Gene flow

Explanation:

Gene flow is a process of gene migration or the transfer of gene variant (also called allele, which is responsible for genetic variation in population) from one population to another population.

As a consequence of gene migration, new alleles are introduced or added in the already existing population, thereby increasing genetic diversity.

Thus, option A) is the right answer.

Plants are classified as producers because they are autotrophs that can generate their own food through photosynthesis. They form the base level of the food chain, providing energy and nutrients for all other organisms in the ecosystem. Without them, the survival of other life forms on earth would be impossible.

Plants are classified as producers in the ecosystem because they can generate their own food using inorganic carbon as a carbon source through a process known as photosynthesis. During photosynthesis, plants harness solar energy and convert it into chemical energy, in turn creating complex organic molecules such as glucose. This ability to produce their own food classifies plants as autotrophs, which include photosynthetic organisms like algae and certain types of bacteria.

In the context of the food chain, plants are often situated at the base or foundation, making them primary producers. The organisms that consume these primary producers are herbivores, known as the primary consumers. This cycle continues up the food chain with secondary, tertiary consumers, all the way to apex consumers, with each level feeding on the one below it. Therefore, without plants and their photosynthesis process, energy would not be readily available to other living organisms in the ecosystem, making life as we know it impossible.

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The ability to taste PTC is thanks to the presence of a minimum of one dominant allele for the PTC taste gene, so a nontaster genotype should be pure recessive(pp). If the frequency of pp is 45%, then the frequency of p would be:

pp=0.45

p= √0.45

p=67%

p+P= 100%

P= 100%- p

P= 100%-67%= 33%

The number of North American population that has is pure dominant(PP) genotype would be:

P=33%

PP= 33%^2= 10.89% = 0.1089 = 0.11

Some people have the ability to taste a bitter chemical called phenylthiocarbamide (PTC).

The shape of the receptor protein determines how strongly it can bind to PTC. Since all people have two copies of every gene, combinations of the bitter taste gene variants determine whether someone finds PTC intensely bitter, somewhat bitter, or without taste at all.

Thus, the ability to taste a bitter chemical called phenylthiocarbamide.

Learn more about phenylthiocarbamide here:

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Answer;

The mouth

For ingested foods, the first opportunity for enzymatic digestion occurs in the mouth.

Explanation;

The digestion of food starts in the mouth.

There is both mechanical and enzymatic digestion of food in the mouth. Mechanical digestion involves the mechanical break down of food using teeth to smaller particles thus increasing the surface are for the activity by enzymes.

Enzymatic digestion in the mouth involves enzyme salivary amylase which acts on starch to form maltose.