The answer I came up with is Echinoderms and Chordates.
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The nervous system and the integumentary system<span />
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The second A is known as the reversal phase in which the intervention is withdrawn to see if the target behavior returns to the baseline behaviour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
The observation that members of a population are uniformly distributed suggests that the members of the population are competing for access to a resource.
Option B is correct.
What is a resource ?
A resource is any physical material constituting a part of Earth that people need and value. Natural materials become resources when humans value them. The uses and values of resources change from culture to culture and from time to time. Resources are spatially distributed varying in quantity and quality.
Why the resources are important?
Resources are necessary for citizenry because of the following reasons: Resources when used as a raw material satisfy the needs and comforts of human beings. Natural resources are a source of agricultural activities which adds to the economic importance. They also provide employment opportunities.
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B. Formal operational stage of cognitive development
