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Snezhnost [94]
3 years ago
6

In the Galapagos Island finches, the variation in the beak shape corresponded to which finch characteristic?

Biology
1 answer:
Temka [501]3 years ago
8 0

Answer: their diet

Explanation:

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zimovet [89]

Answer:

OB. Run-off from fertilized land increases nitrogen levels in ecosystems and encourages algal growth. is the correct answer.

Explanation:

because This in turn is leading to global warming and weather changes.

8 0
3 years ago
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When a chemical reaction is moving at a slow rat of speed, what can be done to speed up the reaction
Mama L [17]

Answer:

To speed up the rate of reaction, you could increase the temperature or the concentration of the reactants.

Explanation:

Basically, the idea is to speed up the molecules' movement and to cause them to break apart or collide at greater frequency

7 0
3 years ago
I will give brainiest!!
Nata [24]

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Human diploid cells have 23 pairs of chromosomes. Because of independent assortment during meiosis I, there are 223, or 8.4 million possible gametes that may be created even if crossing over didn't occur.

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2 years ago
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Describe the process of skeletal muscle contraction by assembling the following 10 events in the proper order in paragraph form.
balu736 [363]

5) muscle fiber is stimulated at the neuromuscular junction triggering an action potential  

7) APs travel down the T-tubules to the sarcoplasmic reticulum  

Released acetylcholine (due to action potential within motor neuron) from the motor neuron initiates depolarisation within the sarcolemma, which is spread through the muscle fibre via T tubules.

8) in response to an AP, calcium ions are released into the cytosol/space around the myofibrils

Depolarisation causes the sarcoplasmic reticulum to release calcium ions necessary for the contraction

3) calcium ions bind to the T and T system

1) T and T system undergoes a conformational change, exposing the myosin binding sites on actin  

6) myosin head/cross-bridges bind to actin

The binding sites for the myosin heads located on actin, are covered by a blocking complex (troponin and tropomyosin) that can be unblocked by the calcium binding

2) myosin heads/cross bridges bind to actin and flex, shortening the sacromere  

4) actin filaments are pulled toward the center of the sacromere, shortening the muscle fiber  

As the individual sarcomeres become shorten the muscle fibres as a whole contracts

10) myosin head continues to attach, flex, release, extend, and reattach as long as calcium ions are present

9) calcium ions actively transported into the sarcoplasmic reticulum  

Relaxation of a muscle fiber occurs when a Ca ions are pumped back into the sarcoplasmic reticulum .

3 0
2 years ago
Explain how the wind may be involved in the formation of sandstone arches.
WITCHER [35]

Answer

Wind may be involved in the formation of sandstone arches by facilitating erosion which wore away exposed sections of rocks and enlarges the cracks on the surface forming marrow sandstone fins.

Explanation

Sandstone arches can be formed when a large piece of sandstone flaked off as a result of high winds. In addition to that, alternative frost and thawing can result into crumbling of porous sandstone which will in the long run cut through some fins. These resulting holes enlarge to form arches with effects of weathering and rock fall caused by wind.



5 0
3 years ago
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