Which of the following best summarizes the passage? Volcanic rocks and mountains are found in Santa Cruz.

Chert has a heavy concentration of silicon and oxygen.

Sand is tiny bits of worn-out rock made mostly of oxygen and silicon.

A few common elements make up most of the planet's many compounds.

(I will insert passage please help !!)

Which of the following is a main difference in cell structure between an onion cell and a human cheek cell? a. an onion cell contains one nucleus, whereas a human cheek cell contains two nuclei. b. an onion cell has a cell wall. c. a human cheek cell contains chloroplasts. d. there is no difference between an onion cell and a human cheek cell. you for your.

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

During the process of two rails or sides break apart and attract new nucleotide bases to form a new and complete strand.