Are centrioles always there? or do they only exist during mitosis

What is the "great pacific garbage patch"? a large area of marine debris concentrated by rotating ocean currents a large area around the pacific rim where debris collects from natural disasters such as tsunamis an area in the pacific ocean where trash is intentionally dumped due to lack of landfill availability a large trash dump located in hawaii

25. what does meiosis create? haploids or diploid? somatic cells or gametes?

Explain how scientists use geologic time to determine the age of landforms.