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lesantik [10]
3 years ago
15

Which defects of neural tube closure are most common?

Biology
1 answer:
geniusboy [140]3 years ago
3 0
Spina Bifida and Anencephaly are the most common.
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Consider the uninoculated tube.
Nostrana [21]

The uninoculated tube is considered to be a negative control because a negative control is an effect of having to show no response. Am uninoculated control is where  organisms are not being inoculated such as having a culture bacteria of not being inoculated with an organism.

3 0
3 years ago
You are a molecule of phosphorus. Choose a starting point in the process you would go through to move through the entire cycle.
noname [10]

Answer:

First I'd be found in rocks. Erosion would wash me into the soil. Then I'd be absorbed by plants, fungi or microorganisms so they can grow. Animals would get me by eating the plants or drinking the water that eroded the rock. The plants and animals die and I'm absorbed back into the soil.

Explanation:

Phosphorus Cycle Steps

The phosphorus cycle is a slow process, which involves five key steps.

Weathering

Since the main source of phosphorus is found in rocks, the first step of the phosphorus cycle involves the extraction of phosphorus from the rocks by weathering. Weather events, such as rain and other sources of erosion, result in phosphorus being washed into the soil.

Absorption by Plants and Animals

Once in the soil, plants, fungi, and microorganisms are able to absorb phosphorus and grow. In addition, phosphorus can also be washed into the local water systems. Plants can also directly absorb phosphorus from the water and grow. In addition to plants, animals also obtain phosphorus from drinking water and eating plants.

Return to the Environment via Decomposition

When plants and animals die, decomposition results in the return of phosphorus back to the environment via the water or soil.  

Plants and animals in these environments can then use this phosphorus, and step 2 of the cycle is repeated.

Human Impact on the Phosphorus Cycle

Humans have had a significant impact on the phosphorus cycle due to a variety of human activities, such as the use of fertilizer, the distribution of food products, and artificial eutrophication. Fertilizers containing phosphorus add to the phosphorus levels in the soil and are particularly detrimental when such products are washed into local aquatic ecosystems. When phosphorus is added to waters at a rate typically achieved by natural processes, it is referred to as natural eutrophication. A natural supply of phosphorus over time provides nutrients to the water and serves to increase the productivity of that particular ecosystem. However, when foods are shipped from farms to cities, the substantial levels of Phosphorus that is drained into the water systems is called artificial or anthropogenic eutrophication. When levels of phosphorus are too high, the overabundance of plant nutrients serves to drive the excessive growth of algae. However, these algae die or form algae blooms, which are toxic to the plants and animals in the ecosystem. Thus, human activities serve to harm aquatic ecosystems, whenever excess amounts of phosphorus are leached into the water.

8 0
3 years ago
Which adaptation is the likely result of convergent evolution?
bezimeni [28]

A result of convergent evolution are the webbed feet of ducks and frogs.

Explanation:

The evolution of the animals, or rather the development of adaptive features, works in very interesting manner. It is very common in nature that animals that are closely related do not share similar characteristics, or the opposite, animals that are not closely related but share similar characteristics. The later case, is referred to as convergent evolution, where totally different animals have developed the same or very similar characteristics in order to be better suited for their environment.

In this case we have the ducks and frogs, and the webbed feet as shared adaptations, or feature. The ducks are birds, while the frogs are amphibians, and their last common ancestor has lived hundreds of millions of years ago. Despite that, both animals have developed webbed feet, and the reason for this has been that both animals have faced the same challenge, swimming and diving, and the webbed feet help them to be much faster and more agile in the water.

Other examples of convergent evolution (in the present and in the past) are:

  • Hyena - Tasmanian devil
  • Sandy cat - Fenec fox
  • Smilodon - Thylacosmilus
  • Bats - Birds

Learn more about the categories of adaptations brainly.com/question/2396978

#learnwithBrainly

5 0
3 years ago
A nurse is caring for a client who has cancer. the clien has decided to stop treatment and requests a refferal to hospice
Dominik [7]
The nurse has to do as the client requested. This is because they have to observe the autonomy aspect of the ethical standard which states that the client's must be respected. Autonomy gives the patient power to make his or her own decisions concerning health care.
8 0
3 years ago
Which pair shows processes that are the reverse of one another?
swat32
We need to see a list
5 0
3 years ago
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