Answer:
Light changes speed in a glass of water.
Explanation:
Answer:
Populations have genetic variation.
The environment changes.
Organisms must have specific traits in order to survive and reproduce.
Explanation:
Natural selection provides an advantage during an adverse condition for organisms that have a rich genetic variation in their population.
Also, environmental changes induced natural selection whereby organisms must adapt to changes around them.
For organisms to survive, they must have specific traits that gives them a competitive reproductive advantage.
Answer:
alkali metals- Group 1
Explanation:
they have less valence electrons and therefore are more reactive
They are found in group 3 of the periodic table.
Answer:
400 meters every 20 seconds
Explanation:
