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Nana76 [90]
2 years ago
9

1. Which kind of evidence did scientists use to determine that some animals moved back to a marine life after first evolving as

land mammals?
a. The fossil record
b. Comparison of homologous structures
c. DNA evidence
d. All of the above
Biology
2 answers:
sergey [27]2 years ago
8 0
The answer is d i think.....
Kruka [31]2 years ago
3 0

Answer:

Instead of gathering evidence from a single field, the pair pulled together research from many disciplines, including paleontology, molecular biology and conservation ecology, to give a far larger picture of what was happening when animals transitioned from the land to the sea across millennia.

Explanation:

it's probably D. all of the above because scientists use all of these examples

but im not 100% sure

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the correct answer is A.

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Which term best describes this step of the investigate process
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In the scientific name, Pan paniscus, Pan represents the name of the ____ while paniscus represents the name of the ____.​
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genus, specie

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The binomial nomenclature is a naming system used by scientists to identify organisms, it's composed by two words, <em>the first refer's to the individual's genus, a small group of closely related organisms, and the second word is the specific name or epithet used to diffetentiate species in the same genus. </em>

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A complex, unlearned, and fixed pattern of behavior common to all members of a species is called:
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The effect of disorder of checkpoints proteins and cell cycle regulation<br> I need help!!!!!!???
Reika [66]

Answer:

LEARNING OBJECTIVES

Identify important checkpoints in cell division

Explain how errors in cell division are related to cancer

The length of the cell cycle is highly variable, even within the cells of a single organism. In humans, the frequency of cell turnover ranges from a few hours in early embryonic development, to an average of two to five days for epithelial cells, and to an entire human lifetime spent in G0 by specialized cells, such as cortical neurons or cardiac muscle cells. There is also variation in the time that a cell spends in each phase of the cell cycle. When fast-dividing mammalian cells are grown in culture (outside the body under optimal growing conditions), the length of the cycle is about 24 hours. In rapidly dividing human cells with a 24-hour cell cycle, the G1 phase lasts approximately nine hours, the S phase lasts 10 hours, the G2 phase lasts about four and one-half hours, and the M phase lasts approximately one-half hour. In early embryos of fruit flies, the cell cycle is completed in about eight minutes. The timing of events in the cell cycle is controlled by mechanisms that are both internal and external to the cell.

Explanation:

Regulation of the Cell Cycle by External Events

Both the initiation and inhibition of cell division are triggered by events external to the cell when it is about to begin the replication process. An event may be as simple as the death of a nearby cell or as sweeping as the release of growth-promoting hormones, such as human growth hormone (HGH). A lack of HGH can inhibit cell division, resulting in dwarfism, whereas too much HGH can result in gigantism. Crowding of cells can also inhibit cell division. Another factor that can initiate cell division is the size of the cell; as a cell grows, it becomes inefficient due to its decreasing surface-to-volume ratio. The solution to this problem is to divide.

Whatever the source of the message, the cell receives the signal, and a series of events within the cell allows it to proceed into interphase. Moving forward from this initiation point, every parameter required during each cell cycle phase must be met or the cycle cannot progress.

Regulation at Internal Checkpoints

It is essential that the daughter cells produced be exact duplicates of the parent cell. Mistakes in the duplication or distribution of the chromosomes lead to mutations that may be passed forward to every new cell produced from an abnormal cell. To prevent a compromised cell from continuing to divide, there are internal control mechanisms that operate at three main cell cycle checkpoints. A checkpoint is one of several points in the eukaryotic cell cycle at which the progression of a cell to the next stage in the cycle can be halted until conditions are favorable. These checkpoints occur near the end of G1, at the G2/M transition, and during metaphase

plz mark me as brainleast my friend

4 0
2 years ago
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