Vertebrates, and a few invertebrates, have a closed circulatory system. Closed circulatory systems have the blood closed at all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities.
Answer:
object permanence
Explanation:
In the year 1936 Jean Piaget,a Psychologists proposed the theory of cognitive development in children. Jean Piaget started this theory after he observed his children behaviour and with this he divided the cognitive development in children into four stages which are given below;
===> sensorimotor stage: from the the time babies are giving birth till they are 2 years old. In the stage, Piaget discussed schemata.
===> Preoperational stage: this stage is from 2 years old to 4 years old.
===> Concrete operational stage: is a stage that occurs between the ages of 7 to 10.
===> Formal operation stage: this is the last stage for cognitive development in children. It occurs from the ages of 11 to adolescence.
<span>the nonlexical component of communication by speech,for example intonation, pitch and speed of speaking, hesitation noises, gesture, and facial expression. hope it helps</span>
Answer:
an addiction to the consumption of alcoholic liquor or the mental illness and compulsive behavior resulting from alcohol dependency
Explanation:
