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skad [1K]
3 years ago
8

In an observational study researchers try not to

Biology
1 answer:
o-na [289]3 years ago
5 0

Answer:

D

Explanation:

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The wings of birds and butterflies have the same function—they enable the organisms to fly. Which statement can be made about th
Marta_Voda [28]

This character trait is known as homoplasy. the definition of  homoplasy that two or more species share a character, but they did not descend from a common ancestor.

This trait is known as convergent evolution, or convergence.

4 0
3 years ago
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When Gregor Mendel crossed a tall plant with a short plant, the F1 plants inherited.
lys-0071 [83]
<h2>Answer:</h2>

a. one allele from each parent

<h2>Explanation:</h2>

An allele in biological sciences is one of the possible forms of a gene that it can inherit. Most genes have two alleles, a dominant allele and a recessive allele. When Gregor Mendel crossed a tall plant with a short plant, the F1 plants inherited an allele for tallness from the tall parent and an allele for shortness from the short parent.

7 0
3 years ago
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Planarians lack dedicated respiratory and circulatory systems. This deficiency does not cause a problem because ________.
ZanzabumX [31]

Answer:

Most cells within planarians tend to be very close to their gastrovascular cavity, in addition to their external environments. Also, planarians have the ability for oxygen and carbon dioxide to diffuse through the cells on their body walls: this makes it unnecessary for these varieties of flatworms to need a dedicated bodily system.

I think the deficiency of dedicated respiratory and circulatory systems in Planarians does not cause a problem because none of their cells are far removed from the gastrovascular cavity or from the external environment. Planarians are free-living flatworms and form the class Turbellarians in the Phylum Platyhelminthes. Flatworms have three tissue layers, that is the ectoderm, mesoderm, and endoderm. 

hope this helps!!!!!....

Explanation:

6 0
3 years ago
Why are dead or weakened viruses used instead of normal viruses to create a vaccine?
vodomira [7]
I think its because vaccines are just to help your body learn how to fight off the virus, it’s not to actually give you the virus. Hope this helped!
5 0
2 years ago
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Constellations are only visible in certain seasons due to the revolution of the Earth toward the constellation. true or false.
WINSTONCH [101]
It is false that constellations are only visible in certain seasons due to the revolution of the Earth toward the constellation. 
3 0
3 years ago
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