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sergeinik [125]
3 years ago
12

A scientist tries to mate the two similar-looking fruit flies Drosophila melanogaster and Drosophila simulans. But he finds that

they are unable to produce viable offspring.What kind of evolutionary barrier could this be?
Biology
1 answer:
wel3 years ago
6 0
The evolutionary barrier is Reproductive Isolation. This mechanism ensures that organisms of different species can not produce offspring. In some cases, such as Mules, the two organisms CAN produce offspring, but the offspring will not be fertile. 
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How do Euglena and sperm cells use flagella?
loris [4]

Answer:

All euglena have chloroplasts and can make their own food by photosynthesis. ... Euglena move by a flagellum (plural ‚ flagella), which is a long whip-like structure that acts like a little motor. The flagellum is located on the anterior (front) end, and twirls in such a way as to pull the cell through the water.

Explanation:

In general, flagellum is a long whip like organ which protrudes to the exterior from the cell body and permits mechanical work without any marked change in the form of the effector cell. In Euglena, there are two flagella. One of them is equal in length to body while other is short.

3 0
3 years ago
Compare the excretory system and urinary system.
olya-2409 [2.1K]
Excretory system and urinary system are both working to remove waste in the human body. but technically, urinary system is part of the excretory system. The excretory system includes the kidney organ which is the main and the most important organ of the urinary system, another part of the excretory systems are the large intestine and the lungs. on the other hand, urinary system aside from kidney includes ureters, urinary bladder and the urethra. when the human body produces waste products, both the excretory and the urinary work together to remove these waste products from the human body.
5 0
3 years ago
Increasing an objects speed by double will cause the kinetic energy to increase by how many times
Nataliya [291]
4 times. It quadruples. 
4 0
3 years ago
In a sample of double-stranded DNA, 10% percent of the nitrogenous
Alchen [17]

Answer:go on google to search it up

Explanation:

4 0
3 years ago
Las proteínas integrales establecen verdaderos canales a través de la membrana plasmática (es verdadero o falso)
inysia [295]

Answer:

This observation is True

Explanation:

Membrane integral proteins can function as ion channels during the transport of molecules through the membrane. Moreover, integral proteins can also act as pores for the transport of specific molecules between both sides of the membrane, ion channels that mediate effector signals, signaling transduction mechanisms capable of amplifying cellular responses and hormone receptors.

4 0
3 years ago
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