Answer:
millipedes were the first of these animal groups to evolve.
Explanation:
Fossils are structural remains of animals from the past. As these animals die, it takes years for the remains to be buried.
The millipedes are at the lower layer of the rock, next to insects, amphibians, and then rodents. This shows that millipedes existed and evolved before the rest of the found animal fossils.
A neuromuscular junction refers to the chemical synapse between the muscle fiber and the motor neuron.
The neuromuscular junction is the site of communication. It's made up of four cell types which are the <em>muscle fibers, motor neurons, Schwann cells, and motor neurons.</em>
The neuromuscular junction also sends signals from the motor neuron to the skeletal muscles. It is responsible for transmitting <em>action potentials </em>from the motor neurons to muscle contractions.
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Answer: Low, High, Lac repressor
Explanation:
The expression of the lac structural genes is low when lactose is absent from the culture medium and is high when lactose is added, because lactose binds to the lac repressor and inactivates it.
When Lactose is present the lac genes is expressed because the substrate lactose act as inducer and binds to the lac repressor and inactivate it. So the gene is expressed.
But in the absence of lactose, the lac repressor binds the DNA and prevent the expression of the lac genes
<span>C. Gallus Gallus. The red junglefowl (Gallus gallus) is a tropical member of the family Phasianidae. It is the primary progenitor of the domestic chicken (though genetic evidence strongly suggests some past hybridisation with the grey junglefowl as well).</span>
