Answer:
d metals
Explanation:
im pretty sure, but if not it is b
Answer:B, an introduced species is not necessarily harmful to the environment, an invasive species has a negative effect
Explanation:
Mutations in animals so they produce more food
The outer coverings that are tough but, flexible provided protection to the land plants.
Answer:
Explanation:
Catalyst is a substance that influences the reaction but does not participate in the reaction
