Problem: Brain:

All vertebrates have a bloodbrain barrier that allows metabolism inside the brain to operate differently from metabolism in other parts of the body. Glial cells play a major role in brain metabolism by controlling the chemical composition of the fluid that surrounds neurons, including levels of ions and nutrients.

Glial cells control what inside the brain?
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A: chemical composition of the fluid that surrounds neurons

Problem: Emotion:

Emotions have been described by some theorists as discrete and consistent responses to internal or external events which have a particular significance for the organism. Emotions are brief in duration and consist of a coordinated set of responses, which may include verbal, physiological, behavioural, and neural mechanisms. Psychotherapist Michael C. Graham describes all emotions as existing on a continuum of intensity. Thus fear might range from mild concern to terror or shame might range from simple embarrassment to toxic shame. Emotions have also been described as biologically given and a result of evolution because they provided good solutions to ancient and recurring problems that faced our ancestors. Moods are feelings that tend to be less intense than emotions and that often lack a contextual stimulus.

What would be an example of mild shame?
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A: embarrassment

Problem: Portugal:

The land within the borders of current Portugal has been continuously settled and fought over since prehistoric times. The Celts and the Romans were followed by the Visigothic and the Suebi Germanic peoples, who were themselves later invaded by the Moors. These Muslim peoples were eventually expelled during the Christian Reconquista of the peninsula. By 1139, Portugal had established itself as a kingdom independent from Leon. In the 15th and 16th centuries, as the result of pioneering the Age of Discovery, Portugal expanded Western influence and established the first global empire, becoming one of the world's major economic, political and military powers.

What age did Portugal pioneer?
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A: Age of Discovery

Problem: Hunter-gatherer:

A hunter-gatherer is a human living in a society in which most or all food is obtained by foraging (collecting wild plants and pursuing wild animals), in contrast to agricultural societies, which rely mainly on domesticated species.

What type of society relies on domestication for producing food?
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A:
agricultural