Point mutations occur when a. one nucleotide is replaced with a different nucleotide. b. a gene's location changes. c. gametes are formed during meiosis. d. long segments of a gene are lost.

There are specialized producers that live in warm water vents deep in the ocean. these producers do not per-form from photosynthesis, but instead perform a similar process with iron and other chemicals. why do you think these producers use this process instead of photosynthesis?

Food contains a sugar called ( ), which is broken down in a process called cellular ( ). this process uses ( ) to break down food molecules and provide energy for cells. fill in the parentheses

Several billion years ago which gas was the least prevailant in the atmosphere