-Are the Galapagos finches and those on the mainland the same species?
Explanation:
- When Darwin visited the Galapagos islands he observed that the small flocks of finches that existed there were very similar to the finches that existed in the mainland of South America except for their beak shape and feeding habits.
- This prompted him to ask the question that 'Are the Galapagos finches and mainland finches the same species?'
- Later on studies made it evident that a few groups of mainland finches migrated to the Galapagos island and occupied different niches.
- They adjusted themselves to the island environment and evolved with new adaptations in beak structure and feeding habits.
- They are now classified into 14 groups out of which 13 exist in the Galapagos island.
- The Galapagos finches are divided into three groups: the ground finches, tree finches and Warbler finches.
Terms that are asked to be used in the response are bolded;
Ocean ridges and trenches are related in a few ways. One of the ways is being created from the movement of tectonic plates on the mantle when they diverge and converge. When tectonic plates diverge they "pull apart" and create trenches. When they converge they "push together" and create ridges, subduction happens here. The tectonic plates move on the mantle of magna from convection currents creating these different boundaries.
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- Heather
Sensory receptors is the answer I found
When an external stimulus crosses the threshold, a muscle fibre will respond.
<h3>The level of the threshold</h3>
- For the identification of the electrical activity carried out by the active muscles, the threshold level is a crucial consideration.
- A portion of the electrical activity carried out by the target muscles may be excluded if the chosen threshold level is higher than the overall activity.
<h3>What is the stimulus threshold for muscle contraction?</h3>
- A certain stimulus magnitude is necessary for muscle contraction.
- The threshold stimulus is the smallest amount of force needed for a stimulus to cause a muscle to contract in response.
- If the stimulus intensity is less than this threshold value, there is no response.
learn more about threshold here
brainly.com/question/28279471
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