Tara thought her backpack was too heavy. She decided to measure the mass of her backpack with her books and binder inside. Then she measured the mass of each individual thing that was inside her backpack. Finally, she found the mass of her empty backpack. She wrote all the masses in a table, shown below. Mass of Backpack & Items Inside Item Mass (in kilograms) math book 3 science book 2 binder 1 empty backpack 1 full backpack 7 Looking at the table, she noticed that adding up all the masses of the items in the backpack equaled the total mass of the full backpack. What did this demonstrate about mass? A. The mass of a full backpack does not depend on what is in it. B. The mass of a whole object is equal to the sum of the masses of its parts. C. The mass of a whole object is more than the sum of the masses of its parts. D. The mass of a whole object is less than the sum of the masses of its parts.

hi,

what occurs during a solar eclipse?

there are small tides across earth.

the moon is between earth and the sun.

p.s. im not sure if the first answer is correct because during a solar ecliphse there are spring tides and i dont know if they are the same.

bacteria that live on the ocean floor are sustained by phytoplankton. phytoplankton, microscopic marine photosynthetic organisms, have a vastly significant role to play not only in the marine food web of which they’re part of, but also on a more global scale. despite their infinitely small size in comparison to other marine organisms, these tiny creatures occupy an immensely important ecological niche: they are the foundation of the marine food web, and as primary producers, play key roles in supporting all other organisms in the marine environment, as well as in the regulation of the earth’s climate through the sequestration of carbon, oxygen production, and other related processes. phytoplankton account for roughly half of all global primary productivity; therefore, their significance extends far beyond the marine environment alone. there is an intriguing sense of irony in the realization that these tiny living beings that often live out their existence unnoticed and undetected by the rest of the world, have such a far-reaching impact on the lives of virtually all other living organisms on the planet, particularly on those in the marine environment. the world that we have become accustomed to has been and is continuously shaped by the workings of these miniscule yet vital “plants of the sea”.

hope this !