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Zarrin [17]
3 years ago
8

____ are thought to be present before vertabrates

Biology
1 answer:
lisabon 2012 [21]3 years ago
8 0

Answer:

Jawless fish was present before vertebrates.

Explanation:

Jawless fish has some characteristics of vertebrates and also considered as the ancestor of vertebrates on earth which is similar in appearance with the hagfish. It was present about 500 to 600 million years ago. They consist of cranium but vertebral column is absent. but with the passage of time, evolution occurs and many animals which was the descendant of this jawless fish having vertebral column or backbone in their body.

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A scientist discovers that a soil bacterium he has been studying produces an antimicrobial that kills Gram negative bacteria. Sh
nexus9112 [7]

The question is incomplete as it does not have the options which are:

resistant

semisynthetic

synthetic

natural

Answer:

Semisynthetic

Explanation:

Antibiotics are the microbial compounds which are obtained from the micro-organisms which are found effective against the bacteria as they act by inhibiting the activity of the bacteria which ultimately kills the bacteria.

These antibiotics can also be distinguished based on their synthesis: natural, semi-synthetic and synthetic antibiotics.

The semi-synthetic antibiotics are the antibiotics which are obtained from the microbes but are modified artificially by making chemical changes to increase the effectiveness of the antibiotic and making the antibiotic as broad-spectrum bacteria.

Since the properties of the antibiotics provided in the question are similar to the semi-synthetic antibiotics, therefore, is considered semi-synthetic bacteria.

Thus, Semisynthetic  is correct.

4 0
3 years ago
After brita learned that penguins cannot fly, she had to modify her existing concept of birds. this best illustrates the process
Otrada [13]
<span>After Brita learned that penguins cannot fly, she had to modify her existing concept of birds. this best illustrates the process of accommodation.</span>
6 0
3 years ago
Natural selection will favor traits that
Ivahew [28]

Answer:

Natural selection doesn't favor traits that are somehow inherently superior. Instead, it favors traits that are beneficial (that is, help an organism survive and reproduce more effectively than its peers) in a specific environment. Traits that are helpful in one environment might actually be harmful in another.

Explanation:

there ya go mate ^^

4 0
3 years ago
Read 2 more answers
when you open a solid room air fresher the solid slowly loses mass and volume. how do you think this happens
LenKa [72]
Because the air freshener is being released out in to open, so it spreads everywhere.
Hope that helps :)
8 0
3 years ago
One of the structures a cell uses to live grow and reproduce. Name this structure
Masja [62]

Answer:

<u>Organelle</u> is one of the structures a cell uses to live grow and reproduce.

Explanation:

Organelles can be defined as different parts of the cells. Each part of the cell being specialized to perform a specific function or task. The organelles can be found floating in the cytoplasm of the cell. Organelles have a wide number of functions like reproduction of cells, generating energy to perform tasks etc. For example, the nucleus is the hereditary material of the cell and it functions to contain all the genetic information in it for reproduction.

6 0
3 years ago
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