Which best describes when our scientific body of knowledge was developed? a. it was developed in ancient times. b. it was developed in the 20th century. c. it was developed by scientists throughout history. d. it was developed in the last 300 years.

The correct answer is C. It was developed by scientists throughout history.

Explanation:

Science is the field that studies the world and mos elements on it through the scientific method that is based on observing, questioning, creating a hypothesis, testing, etc. Additionally, science is trigger by a natural human curiosity for understanding the world. Due to this, science and the knowledge obtained through it are not exclusive of one historical period but have been developed throughout history.

Indeed, scientific knowledge can be traced back to ancient societies such as Mesopotamia or Egypt and during all centuries and periods including classical antiquity, the middle ages, the modern era, and the post-modern era it expanded through multiple fields including medicine, physics, chemistry or biology. However, the paradigms and ideas have changed over time as the development of more precise technologies sometimes prove previous theories or ideas are not true.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation: