The Silurian period occurred before the Neogene period.
I hope this helps.
Answer:
D and B
Explanation:
We know that seeds need optimal amounts of water, oxygen, temperature, and light to germinate. Therefore the student would need to provide warmth because its winter and water because that would satisfy the need for moisture. Hope this helps!
Source: https://extension.psu.edu/seed-and-seedling-biology
At the base of the food chain
Answer:
Option D, A subject is observed both before and after two exposures to the treatment.
Explanation:
In A-B-A-B design the alphabets have following meaning
a) First A – It is the baseline value or the value measured before treatment
b) First B – It is the treatment measurement
c) Second A - It is the withdrawal of treatment
d) Second B – It is the reintroduction of treatment
The second A is known as the reversal phase in which the intervention is withdrawn to see if the target behavior returns to the baseline behaviour
Thus , there are two measurements involved one before the intervention and second after the intervention
Option D is correct
