Both genes need to be recessive in order for a recessive trait to be expressed.
I hope this helps!
D... i took science last year
Answer:
land subsidence,sinkholes,freshwater contamination and having to dig deeper and deeper irrigation wells
Answer:
Option A, oxygen in the atmosphere
Explanation:
The highest level of oxygen reached during this phase of the geological cycle of earth. The oxygen level in Carboniferous period accounted for 35% as compared to 21% of oxygen in the atmosphere in present time.
Due to high oxygen content, the giant and wide varieties of terrestrial animal and plant species evolved. For example – size of insects and carwlies increased, plant became extremely giant, increase in number of tree ferns etc.
