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Drupady [299]
2 years ago
13

The list below shows some events which took place at different periods in the geologic time scale.

Biology
1 answer:
krok68 [10]2 years ago
8 0
Answer is B) 1, 3, 2

Fish with craniums naturally preceded the evolution of sharks, since sharks have craniums. Sharks must have evolved from a cranium-wielding ancestor. 
Sharks evolved about 450 million years ago, before land vertebrates (animals with spines and skeletal systems) even existed. Mammals evolved about 100 million years later. 
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Which of these statements describe a modified endowment contract (mec)?
salantis [7]
The statement which describes a modified endowment contract is this: 'Exceed the maximum amount of premium that can be paid into a policy and still have it recognized as a life insurance contract.
A modified endowment contract is a type of life insurance contract which has been funded with more money than allowed. Such a life insurance will no longer be regarded as life insurance by IRS, it will be considered as a modified endowment contract.
5 0
3 years ago
Need help with this evolution chart some I've filled in yet I'm not sure if they are correct.Plz help anybody
Svetllana [295]

Answer:

This is correct. The remaining portion:

Sympatric species that form interrelationships undergo coevolution.

Allopatric species in different environments can undergo convergent evolution.

Allopatric species in small populations and under intense environmental conditions can undergo genetic drift.

Explanation:

On the basis of geographical distance, speciation is of two major types:

  1. Sympatric
  2. Allopatric

Sympatric Speciation:

Sympatric speciation is the formation of new species with no gergraphical separation from the ancestor. The new and parent species both exist in the same environment but do not interbreed due to mechanisms of reproductive isolation. These involves both prezygotic and post zygotic barriers to reproduction such as timing of mating, sensitivity to pheromones, choice of mating sites or infertility and mismatched gametes. Species formed through sympatric speciation can form interrelationships and undergo coevolution i.e. the evolution of ones species is dependent on the other.  

Allopatric Speciation:

It involves the geographical separation of the parent and new species. These species could be geographically separated by a river, mountain range or land mass.

Although, allopatric species evolve independently, they may develop similar characteristics that serve different functions. Allopatric species in radically different environments undergo convergent evolution i.e. species evolve similar characteristics without any ancestral homology.

Allopatric species that reside in small populations and are under harsh environmental pressures undergo a rapid genetic revolution i.e. genetic drift. This includes the Founder's and bottleneck effect that involve the continuation of a species from very few individuals after a drastic, sudden environmental change.

4 0
3 years ago
The bar graph shows the population of grass, rabbits, snakes, and hawks in an ecosystem. Trapping has affected the population of
Artyom0805 [142]
This will make the other animals not have food because of the decline in rabbits which results in them dying
4 0
2 years ago
A client says that an object placed in the hand is a pair of scissors when the object is a paper clip. which aspect of the clien
BARSIC [14]
In the question stated above, it is very likely that the patient is facing receptive or sensory issues. This is clear when he mistakes one stimulus for another. This might be because he sees one thing but can not distinguish it for another, or he's having problems differentiating one tactile stimulus for another. Either way, the system compromised is the patient's sensory system.
3 0
3 years ago
HELP!! PLS O.o Looking at the heat circulation in the ocean, what might happen to it if large amounts of cold water are added in
Nonamiya [84]

Answer:

The warm upper waters towards the poles from the tropic is done by surface circulation. If large amounts of cold water are added in the Polar regions as glaciers melt then the hot water cannot flow to the poles, the cold water will make the water very dense, which won’t allow warm upper waters to flow.

The effect it would have in the climate of my area is that it will increase the temperature of the local areas because of the rise in temperature of the surface ocean water.

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