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
OverLord2011 [107]
3 years ago
5

A farmer lost most of his crops last year because of insects. This year he decided to use pesticide to kill the insects. However

, some of the insects survived the pesticide and have reproducedThe new population of insects is not affected by the pesticide. After several generations, more insects are born that survive the pesticide. What process explains the change in insect population?
A. natural selection

B. genetic engineering

C. extinction

D. artificial selection
Chemistry
1 answer:
Dominik [7]3 years ago
6 0
The answer would be natural selection I believe
You might be interested in
An object is seen to either speed up, slow down, or change direction. these behaviors are caused by what ?
denpristay [2]
I believe the correct answer from the choices listed above is option D. An object is seen to either speed up, slow down, or change direction due to <span>unbalanced forces. When a system is subjected to unbalanced forces, the object would tend to move or change in motion. Hope this answers the question.</span>
7 0
3 years ago
Read 2 more answers
What can be a personal question about atoms
Damm [24]

Heres a list of questions

1. Define atom.

Atom is the smallest particle of a substance.

2. What are the subatomic particles found in an atom?

The subatomic particles found in an atom are electrons, protons, and neutrons.

3. Define charged particle.

Charged particle is a particle that has an electric charge.

4. Define electric charge.

Electric charge is the physical property of particles such as electrons and protons. Electric charge causes other particles to experience a force.

5. What are the charged particles found in an atom?

Electrons and protons are the charged particles found in an atom.

6. What are the different types of charged particles?

Charged particles are of two types: positive charges and negative charges.

7. What are the negatively charged particles in an atom?

Electrons are the negatively charged particles in an atom.

8. What are the positively charged particles in an atom?

Protons are the positively charged particles in an atom.

9. What is the mass of an electron?

The mass of an electron is 9.107 × 10-31 kilograms.

10. What is the mass of a proton?

The mass of a proton is 1.672 × 10-27kilograms.

11. Define atomic number.

The total number of protons in the nucleus of an atom is called atomic number.

12. Define neutron number.

The total number of neutrons in the nucleus of an atom is called neutron number.

13. Define mass number.

Mass number is the total number of protons and neutrons in the nucleus of an atom.

Mass number can be mathematically written as

Explanation:

5 0
2 years ago
Read 2 more answers
A solution contains 15.27 grams of NaCl in 0.670 kg water at 25 °C. What is the vapor pressure of the solution?
Anvisha [2.4K]

Answer:

The vapor pressure of the solution is 23.636 torr

Explanation:

P_{solution} = X_{solvent}*P_{solvent}

Where;

P_{solution is the vapor pressure of the solution

X_{solvent is the mole fraction of the solvent

P_{solvent is the vapor pressure of the pure solvent

Thus,

15.27 g of NaCl = [(15.27)/(58.5)]moles = 0.261 moles of NaCl

0.67 kg of water =  [(0.67*1000)/(18)]moles = 37.222 moles of H₂O

Mole fraction of solvent (water) = (number of moles of water)/(total number of moles present in solution)

Mole fraction of solvent (water) = (37.222)/(37.222+0.261)

Mole fraction of solvent (water) = 0.993

<u>Note:</u> the vapor pressure of water at 25°C is 0.0313 atm

Therefore, the vapor pressure of the solution = 0.993 * 0.0313 atm

the vapor pressure of the solution = 0.0311 atm = 23.636 torr

5 0
3 years ago
Read 2 more answers
234+34.1 add and round to 2 significant figures
marin [14]
Like this? 234+34.1= 268.1 then round. If it is less than 5 then you round down if it is more then you round up. Because it is less the final number would be 268.1=268
3 0
3 years ago
How many grams of NH3 can be produced from 12.0g of H2?
RSB [31]

Answer:

Balanced reaction:

3 H2 (g)  + N2 (g)  → 2 NH3 (g)

Use stoichiometry to convert g of H2 to g of NH3.  The process would be:

g H2 → mol H2 → mol NH3 → g NH3

12.0 g H2 x (1 mol H2 / 2.02 g H2) x (2 mol NH3 / 3 mol H2) x (17.03 g NH3 / 1 mol NH3) = 67.4 g NH3

Explanation: See above

Hope this helps, friend.

8 0
1 year ago
Other questions:
  • How many moles of Ca atoms are in 1 mol of CaSO4?
    5·1 answer
  • Using the graph below, at what depth does the thermocline begin?
    7·2 answers
  • . A ________________ is formed when two or more ______electrons____ bond by a covalent bond.
    13·1 answer
  • Think about the lab procedure you just read. Label
    7·1 answer
  • Calculate the pH and fraction of dissociation (
    7·1 answer
  • 1. Household bleach (NaOCl) is really a solution of sodium hypochlorite in water. It is made by reacting chlorine gas and sodium
    9·1 answer
  • How are ocean waves different from sound waves?
    7·2 answers
  • Precipitation can mean rain, snow or hail. In chemistry, precipitation is the formation of a _________ from _____________?
    8·1 answer
  • PLS PLS PLS HELP I WILL MARK YOU BRAINLYEST PLS
    13·1 answer
  • I need help with this please
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!