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Alexeev081 [22]
3 years ago
14

Which of the following statements is correct regarding the evolution of flight?

Biology
1 answer:
xxTIMURxx [149]3 years ago
5 0

Answer:

d.The wing-assisted incline running theory postulates that wings were initially used to maintain balance while climbing up slopes.

Explanation:

Two theories were given to explain the origin of avian flight. The top-down theory suggested that the birds' ancestors were tree dwelling species. They took help of wings to glide from tree to tree in order to avoid predator or catch prey. The bottom up theory suggested that the birds' ancestors were ground dwelling species. They took help of wings to maintain a balance and provide a lift for efficient running.

Wing-assisted incline running was a mixture of both the above theories and gave a balanced view point. According to it, birds' ancestors used wings to maintain a balance while running up inclined slopes. The wings helped them to save energy while scaling slopes and eventually a flight mechanism was also developed.

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A bag of sand and a bag of feathers can have the same density if they have different:
Black_prince [1.1K]
Volumes.

If you put equivalent volumes in a bag, where both weigh the same, the density might get equal.


Hope it helped,

Happy homework/ study/ exam!
5 0
3 years ago
Temperature is a way to measure the ___________ energy of particles of matter.
Fed [463]

Answer:

Kinetic

Explanation:

The average kinetic energy of the particles in a material is measured by temperature. The overall kinetic energy of the particles in a material is measured by thermal energy. The higher the particle mobility, the higher the temperature and thermal energy of a material.

3 0
2 years ago
Types of pteridophytes<br>​
valentinak56 [21]

Answer:

The three different types of pteridophytes include:

Ferns.

Horsetails.

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Explanation:

3 0
3 years ago
Black fur in mice (
Tpy6a [65]
The answer is D) 1/2.

Let's imagine that two genes of the genotype can be analysed separately.

Black fur is determined by dominant allele B. In this case, parents Bb and BB will give offspring with only brown fur:
Parents:          Bb     x     BB 
Offspring:     BB   BB   Bb   Bb
Both homozygous (BB) and heterozygous (Bb) offspring will have black fur.

On the other hand, long tails are determined by recessive allele t. Parents Tt and tt will have 50% offspring with short tail and 50% offspring with long tail:
Parents:         Tt         x       tt
Offspring:    Tt      Tt        tt      tt
Heterozygous offspring (Tt) will have short tail, and homozygous offspring (tt) will have a long tail.

So, the offspring will definitely have black fur and will not affect the fraction of the offspring with black fur and long tails from the cross of <span>BbTt × BBtt. But, </span>there will be 2 out of 4 offspring with short tails which is 50% or 1/2. 
5 0
3 years ago
What type of organism is always found on the first step
Fed [463]
No organism is always the first step, except in a wide sense, plants. In the water, plankton is found in first but whereas on land, plants or seeds are eaten first.

Hope it helped!! :)
7 0
3 years ago
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