Which of the following statements is true?
a.
chromosomes make up genes.
b.
chromosomes make up proteins.
c.
genes make up chromosomes.
d.
genes make up cells.
re

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

for a different answer set the answer would be because the oxygen in the water had depleted (apex)