In sexual reproduction, offspring are genetically different from the parents. this is because a) reproduction occurs very rapidly. b) only one parent is involved in reproduction. c) combined genes are received from both parents. eliminate d) there is less variations in daughter organisms.

The following image is of a diatom. it lives in water and gets food from photosynthesis. it is encased in a hard shell made of something similar to glass or sand . a diatom is a(n) because it has a) multi-celled organism; specialized parts. b) vertebrate; a skeleton. c) insect; an exoskeleton. d) single-called organism; only one cell.

What have we learned from fossil evidence about evolution? a) it is an abrupt change. b)the process is observable. c) it takes place during one lifetime only. d)the most complex traits are always selected.

When water freezes, it . contracts expands