Biology, 02.09.2019 00:50 Jerry4891

Sam and his dad were trying to combat the fire ants in the backyard. they tried several brands of fire ant "killing" chemicals but none worked. finally, sam's dad decided to try an old-time idea: pouring grits on the mounds. what question could be used to guide sam's study of fire ants?

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The most obvious and best question could be used is - do grits more effective in killing the fire ants than chemical substances.

Explanation:

In this incident or case, there are two different variables are used that are several fire ants killing chemicals and the grit. Grit worked better in killing in comparison to the other chemicals.

It suggests that there is more effectiveness in the grits than these commercial chemicals. On the basis of the comparison of both variables, the question could be used if grits more effectively killed fire ants than chemicals.

Answer from: Quest

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.

Answer from: Quest

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation:

carbon 14 dating is used to determine the age of the sample by estimating the amount of carbon 14 present in the sample and then comparing it with a reference standard.carbon 14 is a isotope of carbon which is radioactive and unstable. carbon 14 is assimilated by all plants and animals throughout their life from carbon dioxide. however, one the organisms die they stop this assimilation and the carbon 14 content starts to decrease.by knowing how much of carbon 14 is left in an organism after his death, one can estimate the age of the organism. the materials whose age can be estimated by carbon 14 method are the organic compounds. however, some inorganic compounds such as aragonite shell can also be dated.however, if we consider the igneous rocks it is a non living component which never accumulated carbon 14 in it and thus, we cannot use carbon 14 dating method to estimate its age.

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