BIOLOGY HIGH SCHOOL

Darwin hypothesized that there are definite steps to natural selection. Consider the model here. Use the Roman numerals (I - III) to guide you through the steps. Which is an accurate description of Darwin's hypothesized theory of natural selection? A) Sexual reproduction of bacteria cause variation. Some bacteria survive and some do not. Over time all of the bacteria should become extinct. B) In any population, variation exists. Some bacteria are resistant to antibiotics. Most bacteria die, but the bacteria that are resistant survive and reproduce. C) In a population of bacteria that are exposed to antibiotics, some bacteria change their genetic make-up and survive. The new genetic make-up is passed on to offspring. D) There is a change in the environment: an antibiotic is added. Some of the bacteria are capable of changing to the new environment. They survive and reproduce, passing along their favorable traits.

Answers

Answer 1
Answer:

Answer: Option D

Explanation: Natural selection come into action when some change takes place in the environment which affects the survival of the organism. Here the change is addition of antibiotics. So the bacterial cells which were able to adapt to the change, they survived and rest were killed. These resistant bacterial cells would pass on the genes to next generation and gradually population of resistant bacteria would increase.
Answer 2
Answer: I believe the answer is b

Related Questions

______ is waste that is left after the consumer buys the product. It is usually the packaging the product came in, a byproduct of the original product, or the product itself. (1 point)Pre-consumer waste Post-consumer waste * E-waste Rucksack
The chemical reactants on the left produce ________ on the right.
Explain why the following statements are incorrect - As long as an organism survives, natural selection will take place
In mitosis, 1.)__________ parent cell(s) divide into 2.)__________ daughter cell(s).1.) 2 1 2.) 1 2
Which of the following statements is true?Viruses are much bigger than bacteria.Viruses are cells with either RNA or DNA.Viruses are bundles of genetic material enclosed in a capsid.Both viruses and bacteria are living organisms.

Considering that nearly 85 percent of corn crops are genetically engineered, which impact does genetically engineered corn have on human health?

Answers

Genetically modified crops are genetically engineered such that a desired trait is enhanced or reproduced to appear in every offspring. Genetically engineered corn has been engineered to resist pests and herbicides; thus, we have more yield and many people especially in the low class society can afford. A disadvantage, yet is still a debate, is that genetically engineered crops such as corn, has toxic effects to internal organs such as our liver, a vital internal organ. 

Answer:

The long-term effects are unknown and have not been studied because it is a fairly new technology.

Explanation:

Just took the test.

In the cells of the human body, oxygen moleculesare used directly in a process that
(1) releases energy
(2) digests fats
(3) synthesizes carbohydrate molecules
(4) alters the genetic traits of the cell

Answers

The answer is (1) releases energy. In the cells of the human body, oxygen molecules are used directly in a process of cellular respiration during which energy is released. In cellular respiration, glucose and oxygen yield carbon dioxide and water and energy is released in the form of adenosine triphosphate: C₆H₁₂O₆ (glucose) + O₂ (oxygen) → H₂O (water) + CO₂ (carbon dioxide) + ATP (adenosine triphosphate).

When Elaine accidentally touched the hot stove, she immediately pulled her hand away without even having to think about it. This seemingly automatic movement of her hand could not have been possible without the effective operation of the ______________ nervous system.

Answers

Answer:

somatic

Explanation:

The somatic nervous system is one of the components of the peripheral nervous system. The somatic nervous system consists of nerves (sensory and motor nerves) which function in carrying motor and sensory information to and fro the central nervous system. The somatic nervous system is responsible for voluntary movements as well as reflex movements.  

The automatic movement of Elaine’s hand could only be possible with the effective function of the somatic nervous system.

Why is it difficult to reduce human population growth

Answers

the world population grows by millions everyday and its hard to keep those numbers down

Which of the following structures is most likely to be found in an autotrophic protist?

Answers

b. A chloroplast 

The options in the question contain both autotrophs and heterotrophs.
(a) A giant redwood tree = Autotroph
(b) A spider = Heterotroph
(c) A rose bush = Autotroph
(d) A mushroom = Heterotroph
(e) A blue whale = Heterotroph
Autrophs are the organisms that have the capacity to form their own food from inorganic substances like the carbon dioxide. 
Heterotrophs are the organisms that cannot produce their own food but depends on other animals or plants for their nutritional needs. 

A. True
b. False Plankton and nekton are found in the ocean. A shark is an example of nekton.

Answers

The answer is A. True.

Plankton includes a diverse group of organisms that live in the water but are not capable of active swimming against the water current. On the contrary, nekton includes a diverse group of organisms that live in the water but are  capable of active swimming without the help of the water current. A shark is capable of active swimming, therefore, it is the example of nekton.
Other Questions
How is reproduction in a potato different from reproduction in humans?
How are the parts of the solution mixed? A) chemically. B) physically. C) only in water. D) by electronic means.
Before there was any life on earth, which gas was absent from earth’s ancient atmosphere?
Sponges have no nerve tissue or sense organs.explain why this means that sponges have no cephalisation.