The right answer is that a strongest bugs were able to survive pesticides, reproduce and create more resistant pests.
Pesticide resistance is a hereditary trait that gives an organism the ability to survive pesticide application at lethal doses for most individuals of the same species.
This resistance, manifested by the absence of inhibition, or reduced inhibition, of the development of a population of pests, may be natural or acquired.
* It is natural if the phenomenon is observed from the first application of a pesticide.
* It is called "acquired" if the phenomenon is observed only after several applications of a pesticide, as a result of the selection over several generations of naturally resistant individuals.
Harmful species develop resistance to pesticides through natural selection: the most resistant specimens survive and transmit their genetic traits to their offspring.
It is multicellular.
B.
It does not have a nucleus.
C.
It possesses a membrane-bound nucleus.
D.
It possesses a hard outer shell.
The smallest living organisms which are capable of survive independently in nature are those which possesses a membrane-bound nucleus. Thus, the correct option is C.
A cell is the fundamental unit of life. It is the structural and functional unit of all living organisms. Cells are classified on the basis of its structure, function and origin.
Cells contain a nucleus which contains all the genetic material of an organism The genetic material is stored in the form of nucleic acids such as DNA or RNA. A membrane-bound nucleus is present in all eukaryotic organisms. This membrane helps to separate the nuclear material from the cytoplasm.
The presence of a nucleus is important for all the living organisms as this nucleus contains genetic information which is transferred to the offsprings and hence responsible for reproduction and maintaining the number of organisms.
Therefore, the correct option is C.
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B.They can change the distance over which you apply a force.
C.They can change the direction in which you apply a force.
D.They can change the amount of force you exert.
this is science
The correct answer is B. They can change the distance over which you apply a force.
The incorrect statement about simple machines is A. They can change the amount of work done on an object. Simple machines do not change the total amount of work; instead, they offer a mechanical advantage by changing the force and distance relationship.
The statement that is not true of simple machines is:
A. They can change the amount of work done on an object.
Simple machines are designed to make work easier by changing the force and distance relationship. However, they do not change the amount of work done on an object because the product of the force applied and the distance over which it is applied (work) remains constant, according to the law of conservation of energy. A simple machine can change the direction of the force, change the amount of force exerted, and change the distance over which the force is applied, which are the benefits of its mechanical advantage.
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Electron microscopes' specimens can be stained for contrast, while light microscopes' specimens appear black and white
Electron microscopes are used for dissections, while compound light microscopes are not.
Electron microscopes use electron beams and electromagnetic lenses, while compound light microscopes use light and ocular and objective lenses.
Explanation:
D) Electron microscopes use electron beams and electromagnetic lenses, while compound light microscopes use light and ocular and objective lenses.
Microscopes are instruments used for viewing microscopic cellular structures, not visible with the human eye. With an arrangement of lenses, and manipulation of light or electrons, these magnify very small objects. Light microscopy uses light and multiple lenses, while electron microscopes use electrons. These create larger images of objects.
While light microscopes with a resolution power of 0.2 um can view objects at a magnification x1000, electron microscopes are capable of a much smaller resolution at 0.5 nm and magnification of x100,000.
The wavelengths of light in the visible part of the eletromagnetic spectrum (visible light is between 390 nm and 760 nm,) are manipulated in light microscopy. The visible light is passed through the biological sample where it bends, as it travels through multiple lenses. This is often usable on live organisms. Thus the observer can look at cells as they undergo division or locomotion. Resolution describes the shortest distance, where two objects are still visible as distinct bodies. With light microscopes, one may view objects between a millimeter (10-3 m) and a fraction of a micrometer at 0.2 thousands of a millimetre or 2 x 10-7 m.
Unlike light microscopy, electron microscopy involves the manipulation of electrons through the apparatus, under a vacuum. As the beams of electrons have shorter wavelengths than light particles, the images produced have higher resolution and can be seen more clearly. The sample is meticulously prepared, and is typically not made up of live cells; EM can be used in viewing subcellular components, such as organelles and can view structures as small as atoms at 1/10 000 000 of a millimeter, 10-10 m.
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The correct option is (D) Electron microscopes use electron beams and electromagnetic lenses, while compound light microscopes use light and ocular and objective lenses.
A microscope is an instrument that is utilized to amplify small objects. A few microscope might be utilized to notice an object at the cell level, allowing researchers to see the state of a cell, its nucleus, mitochondria, and different Organelles.
Electron Microscope utilizes a light emission and their wave-like qualities to magnify an object's image. The Light Microscope employs visible light to detect tiny objects.
Hence, the correct option is D.
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please i need this asap
Answer:
Cardiac muscle tissue is a type of tissue due to which left ventricle is formed.
Explanation:
Heart is a main organ of human body due to its function. Its main function is pumping of blood to the lungs and to all parts of the body. For this pumping, special type of tissues are required which has the property of elasticity. Cardiac muscles tissue has the property of contraction and relaxation. Cardiac muscles tissue is also called myocardium.