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mestny [16]
3 years ago
15

How does the abnormal shape of a sickled red blood cell affect its movement through blood vessels?

Biology
1 answer:
postnew [5]3 years ago
3 0
A sickled cell has more of a "banana" shapped curve. 

This curve often gets stuck in blood vessels, causing a clot 
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On the Galapagos Islands, Darwin observed tortoises with domed and saddle-shaped shells. How did Darwin's observations of these
photoshop1234 [79]

Answer:

The correct answer would be C.  The tortoises provided evidence that different species have adaptations suited to their particular environments.

Darwin observed that how different environment on different island lead to the development of different species as a result of adaptations and natural selection.

For example, tortoise inhabiting well-watered islands which used to have short and cropped vegetation had developed a dome-shaped shell.  

In contrast, the tortoise inhabiting the arid islands had developed saddle-shaped shells. It is because they needed to stretch their necks in order to reach branches of cactus and other vegetation available in the area.  

Consequently, they developed long necks and high peak to the front edges of their shells. It made it possible for them to stretch their heads vertically.

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3 years ago
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3 years ago
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- Chargaffs rule states...
denis23 [38]

Answer:

Option C

Explanation:

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3 years ago
Why do organisms have varying traits, like different colored eggs?
mylen [45]

the organisms have varying traits, like different colored eggs because of the natural selection.

<h3>What is the process of natural selection? </h3>

Natural selection is one of the main mechanisms of evolution. In a very simple way, we can say that natural selection is a process in which the fittest organisms are selected, survive in the environment, reproduce and pass their characteristics on to their descendants.

the color change of an egg occurs by natural selection and also by genetic variability. since the environment will select the best ones to survive and mutations will occur. Natural selection will forcefully change the environment causing only a few species to survive.

See more about natural selection at brainly.com/question/9830102

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2 years ago
Which of these is one of the nitrogenous bases in DNA?
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D is the answer to the problem





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