Explanation:
The gradient of slope – the steeper the gradient the higher the velocity
the shape of river channel – the more straight the channel (with fewer meanders) the higher the velocity
The volume of water that the river carries – The more water the higher the velocity because more water has more mass that carries more momentum.
The roughness of the substrate or stream bottom – The rougher the river bed is, the slower the river water velocity due to increased turbulence and less laminar flow
The depth & width of the stream – The narrower and deeper the river channel the higher the velocity. This is because the water has a lesser surface area to rub against the river bed as it flows hence gains higher speeds due to lower friction.
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A.
farming
B.
burning fossil fuels
C.
overfishing
D.
deforestation
(2) chromosomes (4) tissues
Answer:
(4) tissues
Explanation:
There are three circles the innermost circle indicated the cells middle circle is the tissues and the outermost circle indicated the organs. Multicellular organisms are made up of thousands of different types of cells .Different cells constitute together forma a tissues and different tissues form a organ and different organs together form an organ system. Hence the X labeled circle denotes the tissues.
Answer:
Oncogenes are mutated protooncogenes (see explanation below).
Explanation:
“Proto-oncogene” is the name given to various genes whose products stimulate cell proliferation. Examples may include growth factor receptors, and proteins involved in clearing cell cycle checkpoints. Mutations in a proto-oncogene may cause it to either become too rapidly transcribed and/or code for a product that functions in an unchecked manner. This may lead to unrestrained cell proliferation, a basic mechanism of cancer. When and if this mutation takes place, the proto-oncogene becomes known as an oncogene.
Oncogenes are altered versions of proto-oncogenes that can lead to uncontrolled cell growth, leading to cancer. They can produce too much or abnormal protein, upsetting the balance of cell division.
Oncogenes are genes which have the potential to cause cancer. In their normal state, they are referred to as proto-oncogenes, contributing to regular cell growth and division. However, when these genes are altered or mutated, they can become oncogenes that stimulate the cell cycle and lead to uncontrolled cell growth - a hallmark of cancer.
Typically, proto-oncogenes help regulate cell division and ensure that cells divide in a controlled way. However, various factors such as genetic mutations, can turn a proto-oncogene into an oncogene. These oncogenes can produce too much protein or abnormal protein, upsetting the regular balance of cell division and halting normal function. This often results in a cell growing and dividing too rapidly, which can lead to a cancerous tumor.
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The genotypes are all of them and the phenotypes are every option that has at least 1 capital letter. The genotypes are internal features and the phenotypes are the features that are visibly present.
A There are no planes of weakness in its lattice structure
B It's not a naturally occurring substance
C It's too new to be a mineral
D It would not be hard enough
The reason why a new rock-like substance created in a laboratory would not be classified as a true mineral is because it does not meet one of the essential criteria for being considered a mineral: being a naturally occurring substance.
Minerals are formed naturally through geological processes over long periods of time. They are typically found in the Earth's crust or other natural environments. However, the substance created in a laboratory is artificially synthesized, meaning it is made by humans in a controlled setting rather than being formed naturally.
For example, if a scientist combines different chemical compounds in a lab and creates a rock-like substance, it may have similar physical properties to a mineral, such as hardness or color. However, since it was intentionally made by humans, it does not qualify as a true mineral.
Therefore, the correct answer is B: It's not a naturally occurring substance