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Sophie [7]
3 years ago
14

Which is a characteristic of all vertebrates?

Biology
1 answer:
Bond [772]3 years ago
6 0

The presence of vertebral column or notochord at any stage of life in any organism is the characteristic of vertebrate.

Explanation:

An animal is vertebrate if it fulfils the following criteria:

Presence of vertebral column or notochord.

Presence of endoskeleton or backbone.

The spinal cord runs above the vertebral column.

Humans embryo has notochord which becomes a vertebral column.

The alimentary canals end in the anus.

Mouth is present ta the anterior side of the vertebrate.

Have legs, fins or wings for movement.

Presence of a nervous system and sensory organs.

Presence of skin, lungs or gills.

Presence of a circulatory system.

Vertebrates include fish, amphibians, reptiles, birds and mammals.

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A mutualistic relationship in which either species can survive without its partner is called a ________ mutualism.
Oxana [17]

Answer:

facultative mutualism

3 0
3 years ago
A student walking at the beach notices that as he walks away from the water, his feet get hotter. Which explanation agrees with
hammer [34]

Answer:

C,

Explanation:

The sand is just small rocks and pebbles broken down, we know that on a hot day rocks can heat up if left alone for long enough especially if they are dry.

4 0
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In some species of Drosophila, there are genes on the Y chromosome that are not on the X chromosome. Imagine that a new allele a
mr_godi [17]

Answer:

True

Explanation:

The Drosophila like the mammals possess X and Y chromosomes but as in males in which the XX is female and XY is male, the sex In Drosophila is not determined by the presence of Y chromosomes as a male determining factor are present on the autosomes.

However, the Y chromosome is important for males as they are involved in the formation of the sperms therefore the presence of Y is important. In the given question if the allele is present ion the Y chromosome which can reduce the size therefore the allele is passed on to the males only ans no females.

Thus, true is the correct answer.

the fly is female (Bridges 1921, 1925). Thus, XO Drosophila are sterile males. In flies, the Y chromosome is not involved in determining sex. Rather, it contains genes active in forming sperm in adults.

3 0
3 years ago
How is pandemic flu different from seasonal flu? It is caused by bacteria. It can cause widespread death. It may seriously impac
mr_godi [17]
B. It can cause widespread death 

it can also

C. It may seriously impact healthy adults.

flu is caused by a virus (influenza) NOT bacteria
Vaccines are made, but may not necessarily be available for a pandemic right away (takes time to develop).
5 0
3 years ago
In aquatic ecosystems, phytoplankton and other photosynthetic organisms appear in the upper layer of the water, but not deeper l
Stels [109]

Answer: alternative A

Explanation: The deeper the layer in water, the <u>less light reaches it</u>. In deeper layers, therefore, it becomes difficult, if not impossible, to photosynthesis to occur. Having in mind that <u>phytoplankton  and photosynthetic organisms depend on photosynthesis to survive,</u> they won't appear in such dephts.

3 0
3 years ago
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