1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
fenix001 [56]
2 years ago
6

According to Darwin's theory of evolution, what causes a struggle for survival in populations?

Biology
1 answer:
yarga [219]2 years ago
4 0

Answer:

In a population, more individuals are born than can survive. The available resources in nature are finite (food, water, space, etc.) and the environment is not able to support unlimited growth of a population. This causes an inevitable struggle for existence among individuals (continual struggle for existence).

Explanation:

You might be interested in
You are working in a molecular biology lab and, unbeknownst to you, your lab partner left the foreign genomic DNA you are planni
fredd [130]

Answer:

B There will be blue colonies only

Explanation:

This screen in called the blue white screening.  This is a rapid test that allows scientist to check for their insert of choice in the colonies at a glance. The concept is that where the insert is located the <em>lac Z </em>gene in the vector is interrupted and therefor Xgal, a reporter can be produced. Where there are blue colonies being formed the plasmid has self-ligated and the <em>lac Z</em> gene is not interrupted and the X-gal can be formed rendering a blue color.

8 0
2 years ago
How much carbon dioxide emissions from human activities is absorbed by carbon sinks? A.75%
Nikitich [7]
I’m pretty sure it’s b.50%
7 0
2 years ago
A process within the cell of an
IrinaVladis [17]

Answer:

Cellular respiration

Explanation:

7 0
2 years ago
N pea plants there is complete dominance for the trait of flower color. the p allele produces purple flowers and p produces whit
Reptile [31]
PP-  purple homozygote
pp- white homozygote
Pp- purple hetrozygote

If these flowers cross, we obtain heterozygote offsprings with a genotype: Pp (100% of them will be like this)

Now, if those offsprings cross with each other: Pp x Pp
results:
  1/4 would be purple  homozygote -> PP
  1/4 would be white -> pp
  2/4 would be purple heterozygotes -> Pp
Genotipic ratio: 3:1 (3 are purple; 1 is white)
7 0
2 years ago
While hiking, you must push aside thick branches that are near your face. One of them rips the skin on your arm and you begin to
matrenka [14]

Answer:

While hiking, you must push aside thick branches that are near your face. One of them rips the skin on your arm and you begin to bleed from the cut. Which of the following plays an important role in initially protecting you from infection?

The answer to the question is option D (barriers such as dead skin cells and mucus because they are part of the innate immune system)

Explanation:

Hiking which is a way to stay physically active can simply be explained as an engage in a leisure-like activity, to walk a long distance or for exercise.

Innate immunity is one of the two main immunity strategies found in vertebrates, is composed of physical, chemical and cellular defenses against pathogens,  such as skin, chemicals in the blood, and immune system cells that attack foreign cells in the body immediately or within hours of an antigen's appearance in the body.

The innate immune system relies on the recognition of particular types of molecules that are common to many pathogens but are absent in the host.

Innate immunity, is something already present in the body which is activated against a specific type of antigen, and the immunity remains throughout the life.

An example of Innate immunity, is the white blood cells fighting bacteria.

Innate Immunity action is usually rapid, and the first line of defense against non-self pathogens is the innate immune response.

Innate type of immunity is generally inherited from parents and passed to offspring.

The main purpose of the innate immune response is to immediately prevent the spread and movement of foreign pathogens throughout the body.

Therefore, during the first critical hours and days of exposure to a new pathogen, the body rely on the innate immune system to protect it from infection.

The skin and other epithelial surfaces, provide a physical barrier between the inside of the body and the outside world.

The mucus layer also contains substances that kill pathogens or inhibit their growth.

Microorganisms do occasionally breach the epithelial barricades. It is then the innate immune system that recognizes and destroy them, without harming the host.

3 0
3 years ago
Other questions:
  • Why does the moon have phases
    6·2 answers
  • Which of the following statements is true?
    5·2 answers
  • Oxidative damage to DNA can often result in the alteration of a single nucleotide.
    6·2 answers
  • During World War II, psychologists redesigned the layout of instruments in airplane cockpits to help pilots fly safely. This is
    12·2 answers
  • During meiosis how many chromosomes does gamete start with
    5·1 answer
  • Review the chart of all the domesticated rabbits. You are interested in producing pigmy striped rabbits. Once you have produced
    9·2 answers
  • Axons are classified into three major groups called A, B, and C, based on their ____________ . Group A has a conduction velocity
    10·1 answer
  • What do the gas giants have in common
    13·1 answer
  • Name three functions of the hormone epinephrine<br>​
    11·2 answers
  • Explain how photosynthesis provides energy for consumers.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!