46.6% oxygen (o)
27.7% silicon (si)
8.1% aluminum (al)
5.0% iron (fe)
3.6% calcium (ca)
2.8% sodium (na)
2.6% potassium (k)
2.1% magnesium (mg)
>
consider the layers of the earth seen here. where would you find the elements listed above?
a) atmosphere
b) core
c) crust
d) mantle

Ineed a chemical reaction takes place in which erlergy is released. arrange the reaction's characteristics in order from start to finis lower energy of reactants higher energy of products higher energy of reactants transition state sd lower energy of products

The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.

Pls me i need this ! each cell has genes activated depending on it's job and what kind of cell it is. it is the presence of that causes the repressor protein to fall off and unblock the gene on the lac operon. if a gene is turned on then it is being an additional circular chromosome found in some bacteria that is used in genetic engineering.