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
Yakvenalex [24]
3 years ago
12

A few mold spores land on the skin but do not survive due to the lack of moisture and the presence of oxygen. These spores have

been prevented from harming the body by which type of barrier?
biological
chemical
physical
mechanical
Biology
1 answer:
maria [59]3 years ago
5 0

Answer:

Physical

Explanation:

The skin is a physical barrier.

Mechanical barriers are made by mucous membranes

You might be interested in
State the five requirements for a population to be in Hardy-Weinberg equilibrium.
mihalych1998 [28]

When it comes to population evolution and genetics, we cannot fail to cite the Hardy-Weinberg principle which emphasizes that if evolutionary factors such as natural selection, mutation, migration and genetic oscillation do not act on a particular population, the frequencies genotypic proportions will remain constant.

The five requirements for a population to be in Hardy-Weinberg equilibrium are:

  • Large-scale breeding population: For a population to be in Hardy-Weinberg equilibrium, it is important that this population is large, as small populations favor genetic drift (unanticipated fluctuations in allele frequencies from one generation to another).
  • Random mating: In order for the Hardy-Weinberg equilibrium to occur, it is necessary that the mating occur at random, with no preference for certain groups within the population. In this case, we say that the population is in panmixia, that is, they all mate at random.
  • No mutations: Mutations alter the total alleles present in a population (gene pool). Therefore, in a Hardy-Weinberg equilibrium population, no mutations should occur.
  • No gene flow: When there is gene flow due to migration or immigration of individuals, some genes may be included or excluded from the population. Thus, in an equilibrium situation, no gene flow occurs.
  • Lack of natural selection: For a population to be in Hardy-Weinberg equilibrium, natural selection must not be acting on it. If natural selection acts, some genotypes will be selected, modifying the allelic frequencies of the population.

5 0
3 years ago
Some of the chemicals that make up living organism have only few structures (like DNA) other have many different structures (lik
elixir [45]

Answer:Proteins have many different functions, while DNA has limited functions.

Explanation:

Chemicals that make up the living organisms consists of more protein than DNA. This is because proteins have different functions while the function of DNA are limited. Excluding water and fat, the human body is made up almost entirely of protein. Most of the structural framework of the body such as bones, muscle, organs, skin and nails are made up of protein.

Protein are responsible to do most of the work in cells by acting as enzymes, hormones and carriers. Proteins are largely required for the structure, function, and regulation of the body's tissues and organs.

7 0
3 years ago
An ovary with ten ovules before fertilization could have ten _____ after
pogonyaev
A........................
8 0
4 years ago
The hematopoietic stem cell gives rise to..
r-ruslan [8.4K]

Answer:

The answer is Abstract.

Explanation:

The hematopoietic stem cell gives rise to.

PLEASE MARK ME AS THE BRAINIEST

6 0
2 years ago
Which question would be asked in a dichotomous key?
Bingel [31]

Answer:

B. Are the insect’s antennae longer than its head?

Explanation:

Dichotomous key refers to the tool or method which helps the scientist to identify organisms.

It uses a specific series of questions which help in segregation of organisms and ultimately help the scientist to identify the organism on the basis of the observations or properties share by the organism.

Example of a simple dichotomous key is shown below.

Similarly, insects can have antennae longer or shorter than their heads. Thus, the question "Are the insect’s antennae longer than its head?" would help in segregating insects based on their antennae length.

happy to help ya:)

8 0
3 years ago
Other questions:
  • Living organisms break down polysaccharides into simple sugars
    10·1 answer
  • Which is a density-independent factor in controlling a population? A. Floods B. Access to light C. Water supply D. Predators
    7·1 answer
  • A magnetic force cannot be created in an electromagnet without which of the folllowing ? A.an electric current b. a magnetic fie
    8·2 answers
  • The land and water ecosystems that provide the resources that a person uses and that neutralize that person’s wastes is part of
    14·1 answer
  • An isotope undergoes radioactive decay by emitting radiation that has no mass. What other characteristic does the radiation have
    5·1 answer
  • The boundaries of plates are created by which of the following
    7·2 answers
  • The Yellowstone area contains organisms representing all trophic levels, including plants, algae,
    12·1 answer
  • Please answer this. i need this.
    6·1 answer
  • Hellooo help please! no random stuff just 50$$!! or coins-
    7·1 answer
  • This is for kealani57 only thx :-)
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!