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Fofino [41]
3 years ago
9

Negative of pest control methods.

Biology
1 answer:
Blizzard [7]3 years ago
5 0

Answer:

Control methods

Biological pest control. Main article: Biological pest control. ...

Cultural control. Cultivation by ploughing exposes insect pests to predators such as black-headed gulls. ...

Trap cropping. Main article: Trap crop. ...

Pesticides. Main article: Pesticide. ...

Hunting. ...

Physical pest control. ...

Poisoned bait. ...

Fumigation.

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Write three sentences that help explain why the frequencies of tusklessness in male and female tend to differ. Each sentence sho
UNO [17]

Complete question:

In the attached files

Answer:

  1. Increasing uncontrolled poaching acts as some kind of <em>"selective pressure"</em>.
  2. Animals that carry the genes to grow tusks are removed from the population, and most of the surviving animals are those that do not have tusk and that carry the gene for tusklessness.
  3. Tuskless animals get to reproduce more frequently, transmitting the tusklessness gene to their progeny, and hence, increasing its frequency in the population.

Explanation:      

Due to technical problems, you will find the complete question, the answer, and the explanation in the attached files.

Download pdf
4 0
3 years ago
Plz help I will mark you brainlist plz if it will let me but plz help me​
Y_Kistochka [10]

Compounds consist of atoms of different elements. In compound the atoms are present in fixed proportion. By changing the proportion compound will changed. For example,

Nitrogen and oxygen reacted to form the compound. By changing the proportion both will form different compound.

NO₂

Nitrogen dioxide consist of one atom of nitrogen and two atoms of oxygen. Their ration is 1 :2

NO

In nitric oxide one atom of oxygen and one atom of nitrogen are present.

Their ratio is 1 : 1.

N₂O

Nitrous oxide consist of two nitrogen atoms and one oxygen. Their ratio is

2 : 1

N₂O₄

Dinitrogen tetroxide consist of two nitrogen atoms and four oxygen atoms. Their ratio will written as 2 : 4

N₂O₅

Dinitrogen pentoxide consist of two nitrogen atoms and five oxygen atoms. Their ratio will written as 2 : 5

3 0
3 years ago
what is the subdivision of the peripheral nervous system that connects to sensory receptors and to skeletal muscles called
vampirchik [111]

Answer:

The somatic nervous system

Explanation:

The peripheral nervous system is categorized into two types: the autonomic and somatic nervous system.

The somatic nervous system controls the voluntary actions of the boys so is also known as the voluntary nervous system and the voluntary system involves the skeletal muscles therefore is also known as the skeletal nervous system.

The skeletal nervous system contains two types of neurons called the afferent neurons which carries the sensory input from the muscle to the CNS ans the efferent neurons which brings the impulse from the CNS to the muscles.

Thus, the somatic nervous system is the correct answer.

7 0
3 years ago
You water three sunflower plants with salt water. Each plant receives a different concentration of salt solutions. A fourth plan
Kruka [31]

Answer:

The fourth plant that receives pure water is the control group.

Explanation:

The election of a control group is essential in an experiment. Its principal purpose is to allow the discrimination of the results obtained by the treatment in the study, in this case, <em>the different concentrations of salty water that each plant receives</em>. The control group provides a reference point. It must be selected from the same population of the treatment groups. Both groups must be similar in every variable that might influence the results, <u>except for the study treatment.</u>

5 0
2 years ago
A marine ecologist counts the number of crabs in three different intertidal regions that are each two hectares. The crab counts
romanna [79]

Answer:

Density is nearly 3 cabs per hectare

Explanation:

Given -

There are three three intertidal regions.

Area of each intertidal region is 2 hectares.

Number of crab in the intertidal regions are as follows -

Intertidal region I - 7

Intertidal region I - 2

Intertidal region I - 6

Sum of crabs in all three regions is equal to

7 + 2+ 6\\= 15

Total area of all three intertidal regions is equal to

2 + 2+ 2\\= 6 hectares

Now density per hectare is equal to total population of crab divided by total area of all the three intertidal regions

Density = \frac{15}{6} \\= 2.5

Density is nearly 3 cabs per hectare

5 0
2 years ago
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