– For over a century, the kilogram was defined by a physical object: a cylinder of platinum-iridium alloy housed in a vault near Paris. Known as the International Prototype Kilogram (IPK), it was the sole official standard. But this “Le Grand K” had a fundamental flaw: it was not portable. Scientists could not carry it to laboratories worldwide without risking contamination or damage.
: Professor Jeffrey Friedman identified a hormone called leptin in mice, which signals the brain's hypothalamus to stop eating.
[Evolutionary Context] ➔ [Modern Sedentary Trap] ➔ [Technological Interventions] (Thrifty Genotype) (Automation & Desks) (Portable Fitness Trackers) a weighty issue ielts reading answers portable
: The answer for blank 1 is " active ," as it's a direct synonym for "physical" in the context of pastimes. The answer for blank 2 is " portable ," which is a near-synonym for the phrase "electronic gadgets and devices" and directly correlates with the keyword you're looking for.
: The text explains that many obese people blame a slow metabolism for their weight. However, research by Dr. Susan Jebb shows that overweight individuals often have faster metabolisms because their bodies require more energy to support more cells and larger organs. – For over a century, the kilogram was
Humans evolved to survive food scarcity by efficiently storing fat, which is now a disadvantage in a world of high-calorie food. Sedentary Lifestyle:
Answer: Obesity is set to overtake smoking as the leading cause of preventable death. Reasoning: This is a common comparison in health texts, highlighting the severity of the issue. Scientists could not carry it to laboratories worldwide
Downloadable versions are often available via Scribd . IELTS Practice Tests Plus Volume 1 Reading Practice Test 2
(or specific paragraph match indicating the economic cost of obesity)
Obesity is highlighted as the primary disorder, often driven by poor dietary habits, high-calorie intake, and sedentary lifestyles.