organisms are classified as either prokaryotes and eukaryotes. which of the following do the cells of all prokaryotes and eukaryotes contain?

Prokaryotes contains a single chromosome and DNA whereas eukaryotes contain true nucleus and organelles.

Explanation:

The cells of all prokaryotes contains a single chromosome and a double-stranded DNA  while on the other hand, nucleus and other organelles are absent whereas eukaryotes contain true nucleus and organelles such as golgi bodies, endoplasmic reticulum, lysosomes, ribosomes, vacuole and mitochondria. True nucleus means the membrane is present around the nucleus.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers