maybe A&C? not entirely sure, but thats my best guess!
Answer:
a critical period
Explanation:
In developmental psychology and developmental biology, a critical period is a maturational stage in the lifespan of an organism during which the nervous system is especially sensitive to certain environmental stimuli(Wikipedia). It is a time during early postnatal life when the development and maturation of functional properties of the brain, its 'plasticity', is strongly dependent on experience or environmental influences(Sengpiel, 2007).
The fact that imprinting is most certain to occur if the opportunity for imprinting is presented to the organism at a very specific age indicates the existence of a critical period in the life of organisms.
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Answer:</h2>
Option B.
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Explanation:</h2>
- <u>Phototropism</u> is the process in which plant grow in response to light. Where "Photo'' means light and ''Tropisms'' are responses to external stimuli in this case stimuli against light.
Now, going back to the question
- Plant cells grows faster in the presence of the hormone auxin.
- As a result when a plant senses a light from a direction, auxin molecules accumulates to the side that is further away from the light, due to which the plant cells that are further away from the light experience a greater auxin concentration and grow faster, due to which shoot gets bend towards the direction of the applied light.
- <u>Gravitropism</u> is a process of growth by a plant in response to gravity pulling on it. Roots show positive gravitropism i.e they will grow with the gravitational pull and stems show negative gravitropism that is they will grow against gravitational pull.
- Auxin is a plant hormone which promotes stem elongation and inhibits the growth of lateral buds.
- Auxin helps in maintaining apical dominance, which means in presence of auxin the plant will grow Vertically upward i.e against the gravity. Hence Auxin promotes gravitropism.
Result: Phototropism and Gravitropism is controlled by Hormones
Answer:
Chemical bonds include covalent, polar covalent, and ionic bonds. Atoms with relatively similar electronegativities share electrons between them and are connected by covalent bonds. Atoms with large differences in electronegativity transfer electrons to form ions. The ions then are attracted to each other.
Explanation:
Are an organisms characteristics determined only by its genes?
Explain. Yes, an organism's characteristics are determined only by It's genes because the parents give their offspring genes which determines their characteristics.
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