The molecular and structural similarities observed among these organisms is best explained by which of the following?

A.

genetic mutations

B.

binary fission

C.

natural selection

D. human impact

What food chains measure?

Glucose, C6H1206, is best described as an) Multiple Choice compound element isotope

During a certain time of the year, the angle of the sun's rays at location C is smaller than the angle of the sun's rays at location D.

In London, peppered moths that were light colored blended in with trees of the area, and were well populated. Over time, pollution caused the bark of the trees to darken, causing a decrease in the number of light colored moths seen.

The characters of metabolism are seen in a dead tree

you are running an experiment trying to figure out how water affects plant growth for three orchid plants you recently bought. The orchids are the same species and you will place the plants next to eachother in the same windowsill.

The living world is organized in levels. Biotic and abiotic factors also can be arranged into levels of biological organization. Put the words below in order from the least complex to the most complex

Which of the following, when taken up by the cell, binds to the repressor so that the repressor nolonger binds to the operator? A) ubiquitin B) inducer C) promoter D) repressor E) corepressor

Which of these organisms would be a producer? A. fish B. grasshopper C. flower D. snake

A 75 year old man need a replacement heart valve. he lives alone and cares for himself. is a mechanical or biological heart more suited for him