Question multiple Choice with a pairs)

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

xxTIMURxx [149]

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.

5 0

3 years ago

Which region of the hip bone articulates with the sacrum?

Ksju [112]

Answer:

Which region of the hip bone articulates with the sacrum? Ilium. The ilium is the largest region of this bone. It articulates with the sacrum at the articular surface.

Explanation:

7 0

3 years ago

1. How did dark matter affect the development of structures in the early universe?

-Dominant- [34]

Answer:

1. It seeded the development of galaxies

2. The percentage of dark matter has shrunk in scientists' estimates since the 1980s

The percentage of unknown material has grown in scientists' estimates since the 1970%

3. Supernovae that are moving away at an accelerating rate.

Explanation:

1. How did dark matter affect the development of structures in the early universe?

It seeded the development of galaxies.

It seeded the development of quasars.

It cooled pockets of gas to form nebulae.

it became part of black holes

2. How has scientific understanding about the composition of the universe changed over time? Select the two correct answers.

The percentage of dark matter has shrunk in scientists' estimates since the 1980s

The percentage of unknown material has grown in scientists' estimates since the 1970%

The percentage of ordinary matter has grown in scientists' estimates.

The percentage of dark energy has shrunk in scientists estimates

3. Which is evidence for the existence of dark energy?

Pulsars that seem to be moving closer at an accelerating rate.

Supernovae that are moving away at an accelerating rate.

Black holes that are expanding at a constant rate.

Galaxies that are rotating at a constant rate.

<u><em>Please don't use these answer's to cheat they are to help only.</em></u>

6 0

3 years ago

Structure and Composition of the Atmosphere-provides oxgen - provides water- provides soil- wataer makes cloud atmsphore gives w

NARA [144]

✌️. abcdefghijklmnopqrstuvwxy

7 0

3 years ago

In the food pyramid, organism A represents a A) carnivore. B) decomposer. C) herbivore. D) producer.

algol13

If it is an animal like an eagle or one who preys on other animals it is a Carnivore, if it is an animal such as a cow or mouse it is herbivore, if it is a mushroom or other fungus it is decomposer, and if it is a plant like a tree or flower it is a producer.

5 0

3 years ago

Read 2 more answers