Nitrogen is a limiting plant nutrient because the bulk of the available nitrogen in the atmosphere is not usable by plants.
Plants are not able to make use of the nitrogen in the atmosphere directly. Atmospheric nitrogen needs to be converted into usable forms before it can be accessed by plants.
The conversion of atmospheric nitrogen to usable form by plants is known as nitrogen fixation and this is achievable by the activities of certain bacteria.
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Answer:
Reproductive success of an individual is measured in term of its genetic contribution to the future generation as compared to that of other individuals of the same population.
Explanation:
Natural selection is the ability of some organisms to survive better and reproduce more due to the presence of some beneficial genetic traits. These individuals are able to leave more progeny as compared to the other individuals of the same population that lack those genetic traits. Therefore, reproductive success represents the ability of an organism to leave more progeny to contribute more to the gene pool of future generations.
Comparing and contrasting a compound light microscope, basically both operate by bouncing tiny particles or waves off of objects in order to make them visible. Electrons are smaller than light photons so we can see smaller objects clearly with electron microscopes. There are disadvantages though. First, color is a function of light wave frequency so we can't see electron micrographs in color. Color can be added artificially though by computer to differentiate structures, (think photoshop). Also, we cannot see electrons so we make them visible by bouncing them off a cathode ray screen similar to a TV set or computer monitor
- Evolutionary biologists believe that the "fight or flight" response was crucial for the survival of many species throughout Geologic Time.
- Both the sympathetic and parasympathetic nervous systems are vital to our health and survival.
- The neural system of all animals is composed of highly specialised cells called neurons which can detect, receive and transmit different kinds of stimuli.
- When the "fight or flight" response has been activated of the autonomic nervous system called the sympathetic division controls this response.
What is human nervous system?
- The human nervous system is divided into two parts,
1. The Central Neural System(CNS)
2. The Peripheral Neural System(PNS)
- The CNS includes the brain and the spinal cord and is the site of
- information processing and control.
- The PNS comprises of all the nerves of the body associated with the CNS i.e., brain and spinal cord.
- The nerve fibres of the PNS are of two types :
1. Afferent fibres
2. Efferent fibres
- The PNS is divided into two divisions called;
a. Somatic neural system
b. Autonomic neural system
- The somatic neural system relays impulses from the CNS to skeletal muscles while the autonomic neural system transmits impulses from the CNS to the involuntary organs and smooth muscles of the body. The autonomic neural system is further classified as;
(i) Sympathetic neural system
(ii) Parasympathetic neural system
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I think that b has the greatest inertia