DDT affects the environment negatively. In the past, DDT was known to not cause harm in human because the molecules of DDT are not absorbed by the human skin. But new studies suggested that humans actually have DDT on their bodies and it stays on the liver, kidneys and others. DDT is being used in agriculture; it would be drained into the bodies of water where fishes live, the fishes will then be eaten by birds, humans and other predators. This flow of contamination shows the interdependence of life on earth.
Answer:
What is a plant produced from a cross between two plants with different genetic constituents called hybrid plant.
Answer:
C. a pre-synaptic neuron involved in egg-laying
Explanation:
Serotonin (5-HT) is a neurotransmitter, i.e., a molecule that binds to specific receptors and thus transmits signals from one pre-synaptic neuron to another target cell. In humans, serotonin is involved in many physiological functions including sleep, mood, emotions, appetite, digestion, etc. Moreover, <em>Caenorhabditis elegans</em> is a model organism widely used in neuroscience research in order to understand neuromodulation at the level of individual neurons. In <em>C. elegans,</em> serotonin modifies behavior by regulating neuronal excitability and synaptic efficiency. Moreover, also in <em>C. elegans,</em> it has been shown that serotonin induces egg-laying and also provides a feedback regulatory mechanism by inhibiting the activity of the pre-synaptic neurons that release it. In consequence, in this case, it is expected that serotonin rescues the loss of function of serotonin receptors required for egg-laying by providing a regulatory feedback loop that contributes to serotonin adaptation.
Out of the given choices, Mendel's observations are translated following this principle; principle of independent assortment. This will make the correct answer choice A.
