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
Vladimir [108]
3 years ago
9

Before a cell can divide it must copy one dna_____at a time in a process called DNA replication.

Biology
1 answer:
Gwar [14]3 years ago
6 0

Answer:

DNA replication is the process by which a molecule of DNA is duplicated. When a cell divides, it must first duplicate its genome so that each daughter cell winds up with a complete set of chromosomes.

Explanation:

You might be interested in
Some species in the weasel family, such as skunks, protect themselves by spraying a foul-smelling musk oil when threatened. Why
Elena L [17]
Before the animal is harmed they spray to keep the predator away 
5 0
3 years ago
Read 2 more answers
Which factor has the greatest importance in determining the characteristics of an aquatic ecosystem?. a. day length. b. water de
IgorC [24]
The factor that has the most greatest importance in determining the characteristics of an aquatic ecosystem will be water depth. The depth will determine the sunlight that the ecosystem will get. The answer will be B. 
8 0
3 years ago
How are DNA and growth/development related?
OLga [1]

Explanation:

Deoxyribonucleic acid (DNA)is a molecule composed of two polynucleotide chains that coil around each other and growth is the increase of size in a child while development is the process in which a child develops his or her skills

3 0
3 years ago
Which statement accurately describes the function of a hormone produced by the adrenal glands? A. Cortisol causes the heart rate
Artemon [7]
Hi!

The answer is <span>D. Epinephrine widens the air passageways in the lungs.

Hope this helps!

-Payshence xoxo
</span>
6 0
3 years ago
Read 2 more answers
1. How many food chains make up the food web?
viva [34]

Answer:

A food web can be formed by more than one food chain, since the webs includes all possible interactions that can occur between individuals of different trophic levels.

Explanation:

Based on the scheme shown in the image

<h3>1. How many food chains make up the food web? </h3>

This food network is made up of three food chains

  1. <em>Plant → Bird → Snake</em>
  2. <em>Plant → Insect  → Bird → Snake</em>
  3. <em>Plant → insect → Frog → Snake</em>

Food webs often include several food chains, since they are due to the interaction between organisms at different trophic levels, which actually happens within an ecosystem.

<h3> 2. Which organism is an herbivore? </h3>

In this case, both the insect and the bird are herbivorous organisms, since they feed of the producer, which is the plant.

<h3> 3. Which organism is an autotroph? </h3>

The only autotrophic organism is the plant, since it is capable of manufacturing its nutrients from sunlight and inorganic matter.

<h3> 4. Which organism is a third-order heterotroph? To what trophic level does that organism belong? </h3>

The third order heterotroph is the snake, since it feeds on other animals.  The snake is a carnivore and can be a secondary or more commonly tertiary consumer, so it can be placed in the 3rd or 4th trophic level.

<h3> 5. Which organism is an omnivore? </h3>

According to the scheme proposed, the bird is omnivorous, since it feeds on both plants and insects.

<h3> 6. Which organisms belong to more than one food chain? </h3>

In this case, the plant, the insect, the bird and the snake are part of more than one food chain.

  1. <u><em>Plant → Bird → Snake</em></u>
  2. <u><em>Plant → Insect  → Bird → Snake</em></u>
  3. <u><em>Plant → insect</em></u><em> → Frog → </em><u><em>Snake</em></u>
<h3> 7. Which organism belongs to more than one trophic level? </h3>

The bird can be located in both the second and third trophic level, being a primary consumer —when it feeds on plants— or secondary, when it feeds on insects.

<h3> 8. What are decomposers? From which trophic levels are the organisms that decomposers feed on? </h3>

Decomposers are generally bacteria and fungi, organisms capable of degrading organic matter, thus enriching the soil. Decomposers can feed on any trophic level.

<h3> 9. What does a pyramid of energy show about the amount of energy available at different trophic levels of a food chain? </h3>

As the ascent of the pyramid occurs —or at the upper trophic level— the amount of energy available decreases. This is because from one trophic level to another only 10% of the energy can be used. If a plant has 5000 Kcal available, the herbivore that consumes it can only use 500 Kcal.

<h3> 10. Why do different trophic levels have different amounts of energy?</h3>

The main <u>reason for the difference in energy in each trophic level is that energy is lost in each one of them</u>, which the organisms use in their metabolism. A consequence of the metabolism is the loss of energy as heat, which is acquired by the environment.

8 0
3 years ago
Other questions:
  • A substance when dissolved in water increases the H= ion concentration of the solution. Which type of solution is formed?
    14·1 answer
  • The body monitors the levels of oxygen in the blood to regulate breathing. Isabel is running in a marathon and is near the finis
    15·1 answer
  • A pollen tube is essential to the process of pollination because _________________________. Select one: a. it creates pollen b.
    7·1 answer
  • Bacteria disease may become difficult to cure when bacteria?
    8·1 answer
  • How do you think scientists use these types of structures to determine how organisms are related?
    12·1 answer
  • The percentage of a hunter-gatherer society’s diet provided by hunting versus gathering was mostly determined by _______.
    6·1 answer
  • Cross bridge formation between myosin heads and actin molecules is caused by the elevation of calcium ion concentration in the c
    15·1 answer
  • Explain why most enzymes perform poorly at low temperatures​
    14·1 answer
  • Can someone give me the answers and teach me how to do this?
    8·1 answer
  • How many national parks are in the u.s
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!