1.) Trace Fossil: Any indirect evidence left by an organism.
2.) Molds and Casts: An impression of an organism.
3.) Replacement: original material of an organism; replaces with minerals that can leave detailed replicas of hard or soft parts.
4.) Petrified or Per-mineralized: empty pore spaces are filled by minerals such as wood.
5.) Amber: preserved tree sap traps an entire organism.
6.) Original Material: mummification or freezing preserves original organism.
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Answer:
Rosalind's x-ray showed that the ladders of nucleotides were inside a double helix.
Watson and Crick built models with the ladders on the outside.
Answer:
No light gets absorbed by chlorophyll means the plant can't do photosynthesis. Trees and plants are green because of a green pigment called chlorophyll. This pigment absorbs red light the best, and converts the light into energy that it uses for metabolism.
Explanation:
An amino acid is a molecule that contains two functional groups , an amine<span> and a</span>carboxylic acid<span> , as shown in Figure 1. In this illustration there is an additional group called the side chain, designated with an R. The variation seen in naturally occurring amino acids arises from differences in this side chain.</span>
<span>The hypothesis was that the cause of stomach-ulcers
is Helicobacter pylori and not spicy food. Marshall and Warren were able to
prove that the main cause of peptic ulcers was the bacterium Helicobacter
pylori instead of the spicy foods and stress, which physicians believed were
the main causes of peptic ulcers at the time.</span>