The correct answer is B. DDT was considered harmful and was replaced by other pesticides
Answer:
The answer is Predator.
Explanation:
The order of organisms that they would find in the layers of these sedimentary rocks is; Oldest organisms are at the bottom and the newest organism is in the top-most layer of the sedimentary rocks.
Sedimentary rocks are rocks that are made by the deposition and compression of other rocks or pieces of organic matter (dead plants and animals). According to the law of superposition which states that in a sequence of undisturbed sedimentary layers, the youngest layer is always at the top while the oldest layer is always at the bottom of the sequence. From the question, the organisms are components of the rocks. The oldest organisms will be found at the bottom layer of the sedimentary rocks while the newest organisms are in the topmost layer of the sedimentary rocks.
Answer : He needs to use a larger sample size to improve his experiment.
Explanation : As Johannes wants to know whether soil, water, or both are needed for plant growth. He chooses to conduct experiments on a willow tree for five years. To get the improvement in his experimental methods he can choose a larger size of the sample and test its results. As larger size will allow him to gauge accurately on the smaller factors and results will be more reliable. Larger sampling will ensure the homogeneity of the test sample, which will yield better and reliable results.
Johanneswants to know whether soil, water, or both are needed for plantgrowth. He chooses to conduct experiments on a willow tree for fiveyears to answer his question. His experimental methods can be changedby testing more factors in the environment. This will improve hisexperiment.
Ihope it helps, Regards.
The right answer is Change in color, production of gas, formation of precipitate.
Chemical changes alter the nature and characteristic properties of matter. New substances are formed as a result of the reaction.
It is said that a pure substance has undergone a chemical change if it has been transformed into one or more new pure substances which do not have the same properties as the starting substance.
The characteristic properties of the substances disappear and the products formed have new properties.
There are several (even more than three) that can recognize the presence of a chemical change.
* The formation of a gas (effervescence)
* Production or absorption of heat
* The production of bright light
* A significant color change
* A change of smell
* The formation of a precipitate
A. adverb phrase
B. adjective phrase
C. noun phrase
D. infinitive phrase