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Contact [7]
3 years ago
13

On the Galapagos islands, Charles Darwin studied many species of finches found nowhere else in the world. Each species had devel

oped unique structures for eating different foods. Darwin's finches are among the best examples of an evolutionary process by which new biological species arise. This process is known as...
Biology
1 answer:
Sedbober [7]3 years ago
7 0

When Charles Darwin stepped ashore on the Galapagos Islands in September 1835, it was the start of five weeks that would change the world of science, although he did not know it at the time. Among other finds, he observed and collected the variety of small birds that inhabited the islands, but he did not realize their significance, and failed to keep good records of his specimens and where they were collected.


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Ian waterman was able to sense pain and temperature because his _____ pathway was intact, but could not feel touch and limb posi
ANEK [815]
<span>Ian Waterman was able to sense pain and temperature because his spinothalamic pathway was intact, but could not feel touch and limb position because of damage to his lemniscus pathway. </span>

The lateral spinothalamic tract is a sensory pathway which carries sensory information like pain and temperature to the brain, across the thalamus. Free nerve endings which are located in the peripheral tissues are sensitive to cell damage. Those are primary neurons and they pass the sensory signal. Primary neurons synapse with secondary which are located in the spinal cord (white matter). These secondary neurons will ascend through the brainstem, medulla oblongata, pons and midbrain, until synapsing in the ventroposteriorlateral (VPL) nucleus of the thalamus. From the thalamus, the information is sent to cortex (somatosensory cortex).

Posterior column-medial lemniscus pathway is ascending spinal tract, carrying sensory information to the brain (sensory pathway). It conducts localized sensations of fine touch, vibration and proprioception (position sense) from the skin and extremities (muscles) to the central nervous system (cerebral cortex).

8 0
3 years ago
The common garter snake (Thamnophis sirtalis) is found throughout North America. In the South, it is active year round. In the N
Stells [14]

Answer:

The common garter snake (Thamnophis sirtalis) is found throughout North America. In the South, it is active year round. In the North, it is active during the warmer months but hibernates during the winter. It is commonly found basking on warm rocks during cool mornings. This lifestyle indicates that the snake is probably <u>heterothermic</u>.

Explanation:

Being heterothermic, like all reptiles, garter snakes bask in the sun to regulate their body temperature. During brumation (the reptile equivalent of hibernation), garter snakes typically commonly den together. Sometimes there will be as many as 100 snakes in one cave. A large, communal or group site is called a hibernaculum they occupy is called hibernacula. These snakes will migrate large distances to brumate.

Snakes do not actually hibernate, rather they become less active during cold weather. It is called "brumation."  Brumation is an extreme slowing down of their metabolism. Snakes are awake, but just very lethargic so you don't see them moving around.

During fall, snakes go back to the previous year’s den. When a sudden cold catches them before they get there, they may die if not fortunate enough to  find a suitable secondary den. They usually do not stay long at the den entrance, but hurry in for the long winter sleep.

Cold-blooded animals like snakes, fish, frogs, and turtles need to spend the winter inactive, or dormant,  because they have no way to keep warm. Snakes will crawl into any area free from frost such as caves, hollow logs, holes under trees and stumps, under wood piles, in other animal's burrows, and occasionally in a person's basement.

7 0
3 years ago
Non-polar covalent bonds result in one region of the molecule having a slight negative charge and the other a slightly positive
otez555 [7]

Answer:

True.

Explanation:

Non-polar Covalent bonds have one half of the atom that incorporates a net negative charge whereas the other half keeps up a positive charge

Hopefully, this helped!

Feel free to mark brainliest! :)

8 0
3 years ago
Read 2 more answers
How was the earth first formed?
neonofarm [45]

Answer: the earh was formed by  GOD

Explanation:

6 0
3 years ago
Science Grade 8
cluponka [151]
By using a genetic diagram or a punnett square, we can show the the result of a cross between RR and rr.
The result of the genotypes should all be Rr.
This means all their offsprings should have the dominant trait being expressed.
Therefore, the percentage to this should be 100%.
The picture above is an example of using a punnett square finding the possible genotypes of the offsprings.

6 0
3 years ago
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