What is the evolution of flight?

2 answers:

8 0

Why wings (and hence flight)evolved from this point is a matter of contention among scientists; various hypotheses proposed include: Wings evolvedfrom arms used to capture small prey. ... Wings evolved from gliding ancestors who began to flap their gliding structures in order to produce thrust.

riadik2000 [5.3K]3 years ago

3 0

Two hypotheses have been proposed for the origin of insect wings. One holds that wings evolved by modification of limb branches that were already present in multibranched ancestral appendages and probably functioned as gills. The second proposes that wings arose as novel outgrowths of the body wall, not directly related to any pre-existing limbs. If wings derive from dorsal structures of multibranched appendages, we expect that some of their distinctive features will have been built on genetic functions that were already present in the structural progenitors of insect wings, and in homologous structures of other arthropod limbs. We have isolated crustacean homologues of two genes that have wing-specific functions in insects, pdm (nubbin) and apterous. Their expression patterns support the hypothesis that insect wings evolved from gill-like appendages that were already present in the aquatic ancestors of both crustaceans and insects

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Scientists use many resources to piece together the history of life on Earth. The fossil record is one source of information tha

astraxan [27]

Answer:

See explanation

Explanation:

Fossil records contain an extensive detail of the evolution of various species on earth which have been preserved in the remains of these organisms or imprints that organisms that existed long ago must have left in sedimentary rocks.

Fossil records basically tell us about the past. They tell us about the species that once existed on earth. They also tell us how long these species existed and how the were related to other species.

This information help us to work out how these organisms lived and the environment where they lived.

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3 years ago

How do the lymph and immune systems depend on the cardiovascular system?

kari74 [83]

The correct option is C.
The heart is part of the cardiovascular system. The heart pump the blood round the body several times in a day. The blood is made up of several types of cells which carry out specific function in the body, these include the white blood cells which serves as soldiers of the body. The lymph refers to the fluid that circulate throughout the lymphatic system. Both the blood and the lymph are carried round the body by the cardiovascular system during the process of circulation.<span />

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3 years ago

Can someone pls help me I would appreciate it!

lakkis [162]

1. 2
2. 34
3. 34
4. 2

Explanation:
2
34
34
2

7 0

2 years ago

What organisms are responsible for cycling nitrogen from the atmosphere into soil and living things?

Gnom [1K]

Answer:

Bacteria play a central role

Explanation:

Nitrogen-fixing bacteria, which convert atmospheric nitrogen to nitrates. Bacteria of decay, which convert decaying nitrogen waste to ammonia. Nitrifying bacteria, which convert ammonia to nitrates/nitrites.

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Vlad1618 [11]

Removing the parathyroid gland will cause an imbalance within hypothalamus.

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3 years ago