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iragen [17]
4 years ago
15

A woman treated her home with a pesticide that kills spiders. The first application killed 78% of the spiders. Two months later

she applied the pesticide again, but it only killed 45% of the spiders. What would best explain the decrease in the effectiveness of the pesticide?
Biology
1 answer:
WARRIOR [948]4 years ago
7 0
Natural selection. Only spiders that were more resistant to the pesticide lived through the first spraying of the pesticide, thus we're the only ones that could reproduce. This in turn made the offspring of the previous generation more resistant as well; thus making the pesticide less effective.
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DV
Georgia [21]

That question, this incomplete. The full question is:

3. Three redwood trees are kept at different humidity levels inside a greenhouse for 12 weeks. One tree is left outside in normal conditions. The heights of the trees are measured once a week. What are the dependent variables, independent and the controlled variable of this experiment?

Answer:

  • Independent variable: different humidity levels
  • Dependent variable: the heights of the trees
  • controlled variable: the types of trees

Explanation:

An independent variable is one that exerts an influence within the experiment and can be measured, acting on other elements to promote the observation of a result. As the experiment seeks to observe the influence of humidity on the height of the tree, we can say that humidity is the independent variable.

Dependent variable is that which is influenced by the independent variable to generate a result that can be observed, can also be measured. As the experiment wishes to analyze how the height of the trees was affected by the level of humidity, we can say that the height of the trees is the dependent variable.

Controlled variable is that which is present in the experiment in a constant and equal way, cannot be measured. This variable is the type of trees.

4 0
3 years ago
Proteins and nucleic acids both play vital roles in the structure and function of cells.
Eva8 [605]

Answer:

Part A: Proteins are made from amino acid monomers. There are 20 different types of amino acids which make up all the proteins of the body. The amino acids are made up of a carbon atom which is joined to an amino group, a carboxyl group and a variant group, known as R. Nucleic acids are made up of 5 carbon sugar, phosphate group and nitrogenous bases.  Hence, nucleic acids are made up of nucleotides.

Part B: Protiens are important molecule which carry out various functions of the body. They are involved in regulation of various body process. Some proteins are involved in the transportation of various molecules. Other type of proteins are involved in various immune functions and hence protect the body. For example, antibodies are proteins which defend the body against pathogens.

Nucleic acids are involved in the storing and expressing of genetic information. They also direct the body for protein synthesis.

7 0
3 years ago
Match the given symbol or molecular formula to the term that best describes it.
tankabanditka [31]

Answer:

EA SPORTS

Explanation:

SO2: inorganic compound

k: element

Cl2: inorganic elemental molecule

C6H6: organic compound

4 0
3 years ago
What is the chance of an accidental discovery happening?
Anit [1.1K]
A little bit less than a purposely discovery. A discovery that you've been looking for for a while would be like 75% of discovering but accidentally would be 35% of actually discovering something accidentally.
3 0
3 years ago
Read 2 more answers
Which sugar is present in the nucleic acid that is represented in the diagram?
katovenus [111]

Answer:

The answer is deoxyribose

3 0
3 years ago
Read 2 more answers
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