Which word correctly fills both blanks in the description below?

meiosis is an early step in sexual reproduction. in the process of meiosis, pairs of separate and segregate randomly during cell division to produce gametes containing one of each pair.
a. haploid
b. chromosome
c. diploid
d. centromere

there really is life in the deepest part

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added