Biology I- chapter 26

Spontaneous generation is the idea that __ could give rise to living organisms.

nonliving material

The hypothesis that states life comes from life is called __.

biogenesis

The four overlapping stages hypothesis outlines the process of life originating through __, followed by the formation of RNA, DNA, and proteins.

the formation of nucleotides and amino acids

The __ theory states that a cosmic explosion occurred resulting in the formation of stars and elements essential for life.

Big Bang

Fossils are the preserved remains of past life on Earth, often found in __ rocks.

sedimentary

The age of fossils can be estimated through __ dating and analyzing the order of rock layers.

radiometric

In the geological timescale, prokaryotes appeared around __ billion years ago.

3.8-3.5

Extinction refers to the __ of a species or groups of species due to environmental changes.

complete loss

Changes in temperature and atmospheric conditions have historically influenced the __ of organisms.

evolution

The first macromolecule in protobionts is hypothesized to be __.

RNA