BIOLOGY HIGH SCHOOL

Scientists today can use many experimental methods to study evolution. Which method was developed after Darwin’s time?DNA comparisonsobservationsfossilsexperimentation

Answers

Answer 1
Answer:

DNA comparisons was developed after Darwin's time and have become an important method for studying evolution.

While Darwin was able to make observations of variation and adaptation in different species, he did not have access to the genetic information that DNA provides. It wasn't until the discovery of the structure of DNA in 1953 that scientists began to explore the use of DNA in studying evolution.

Since then, DNA sequencing and comparisons have become increasingly important tools in the study of evolutionary relationships and processes.

In science, DNA comparison is a ground-breaking technology. It has given researchers the ability to compare and contrast DNA samples with previously unheard-of accuracy.

Researchers can learn a great deal about genetic links and diseases as well as create brand-new remedies for illnesses by examining these traits.

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Which of the following is not a reason for the lack of a fossil record from the Precambrian time? A. The single-celled organisms that existed during that time did not leave easily identifiable fossils. B. Like the rocks of the Phanerozoic eon, Precambrian rocks contain many visible signs of complex life forms. C. Multi-celled organisms evolved in the oceans during the latest years of the Precambrian time. D. Precambrian rock has been eroded or metamorphosed over billions of years, and very little of it remains at the surface.

Answers

The right answer is B

The development towards 1.4 Ga of eukaryotes, aerobic organisms such as unicellular algae, will be decisive for the oxygenation of the Earth's atmosphere.

The first multicellular organism is a red alga dating back to 1200 Ma during the Mesoproterozoic era (part of Precambrians). Various forms of life with soft bodies dated between 600 and 541 Ma constitute what is called the Vendian fauna, that is to say the fauna of the Ediacarien.

The appearance of a great diversity of small shelly fauna from 541 Ma will mark what is called the Cambrian explosion.

A fern grows sporangia under its fronds. What is the next step in its life cycle?

Answers

Once the spores are "ready" they get released from the fronds, where they travel using natural sources (water, wind, etc.) to other areas where they may be able to act as seeds do. They eventually grow into ferns themselves if they fall into areas where the conditions are just right for their growth. 

Difference between autosomes and gametes

Answers

Answer:

An autosome corresponds to a somatic chromosome, which defines structural and functional characteristics in an individual, while the gamete is a cell containing autosomes, useful in sexual reproduction.

Explanation:

The somatic chromosomes are called autosomes, since they contain the genetic information necessary to define the structure and functions of a living being. In humans, there are 23 pairs of chromosomes, of which 22 pairs correspond to autosomes.

The gametes, or sex cells, are in charge of transmitting the genetic information from parents to offspring, and are formed by chromosomes. As gametes are haploid cells, they possess half of the chromosome load, that is, in the human being there are 22 autosomes.

Generally speaking, an autosome is a somatic chromosome, while a gamete is a cell containing autosomes.

What is the definition of genetic material

Answers

the definition is:genetics definition. The study of heredity, or how the characteristics of living things are transmitted from one generation to the next. Every living thing contains the genetic material that makes up DNA molecules. Thismaterial is passed on when organisms reproduce.

Which of the following is most likely the reason that nations raised tariffs on imports during the Great Depression?a. They wanted to help other nations profit from trade.
b. They wanted to terminate all trade with other nations.
c. They wanted to increase sales of their own products.
d. They wanted to encourage more profitable imports.

Answers

There were several reasons why the nations raised tariffs on imports during the Great Depression. One of the biggest reasons was they wanted to increase the sales of their own products. 

Answer;

C. They wanted to increase sales of their own products.

Explanation;

  • The Great depression was a global economic depression that occurred in 1930's. The depression started in the US, and caused drastic declines in output, acute deflation and also severe unemployment among other effects.
  • The Great depression was worsened by protectionism rise all over the world, where trade between countries was restrained through methods such as tariffs on imported goods, restrictive quotas among other government regulations.
  • For example The Tariff Act of 1930,raised U.S. tariffs on over 20,000 imported goods. This made other nations to impose tariffs on American-made goods in retaliation, which reduced the international trade and also worsened the great depression.

Please Help!!! I am super stuck on this question. If you could also explain how to do big punnet squares, or tell me a site the can explain it to me, that would be great! = )                                                                                                                                                                             A dihybrid cross is created from plants that are heterozygous for both round seeds and yellow seed color. What is the ratio of offspring that have round seeds and yellow seed color? Choose from the following: 1:16 3:16 9:16 16:16

Answers

on e2020 the answer is 9:16
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