A forensic scientist is analyzing a fabric sample from a crime scene. To determine the fabric's composition, they perform a burn test. The fabric ignites quickly, burns with a bright yellow flame, produces black smoke, and leaves a hard, black, irregular bead. These characteristics are most consistent with which type of fiber?
In certain cattle breeds, the allele for red coat color (R) and the allele for white coat color (W) are codominant. When a red cow is crossed with a white bull, the offspring have a roan coat, which consists of a mixture of red and white hairs. If two roan cattle (RW) are crossed, what is the expected phenotypic ratio of their offspring?
A mountain range is located near a large ocean. The prevailing winds blow from the ocean towards the mountain. Which of the following descriptions most accurately explains the climate on the windward (ocean-facing) and leeward (inland-facing) sides of the mountain? ```mermaid graph TD subgraph Air Movement A(Moist Air from Ocean) -->|Rises & Cools| B(Condensation & Precipitation) B --> C{Mountain Peak} C -->|Descends & Warms| D(Dry Air) end subgraph Land Ocean -- Prevailing Winds --> WindwardSide[Windward Side] WindwardSide --> Mountain[Mountain Range] Mountain --> LeewardSide[Leeward Side] end B --> WindwardSide D --> LeewardSide ```
A student adds a catalyst to a chemical reaction. Which of the following effects will the catalyst have on the reaction? (Select TWO)
True or False: In a food web, energy flows from consumers to producers, while matter is destroyed at each trophic level.
**Case Study: The Algae Bloom** A small farming community surrounds a freshwater lake that is popular for fishing and recreation. Over the past several years, residents have noticed a significant increase in the frequency and severity of algae blooms during the summer. These blooms create a thick, green scum on the water's surface, produce a foul odor, and have been linked to several fish kills. The community hires an environmental scientist to investigate the cause. The scientist collects water samples from the lake and from the streams that feed into it. Lab analysis reveals exceptionally high levels of nitrates and phosphates in the lake, particularly after heavy rainfall. The scientist also notes that the largest stream feeding the lake runs directly through several large agricultural fields that are regularly treated with fertilizers. Based on the evidence presented in the case study, what is the most likely cause of the increased algae blooms in the lake?
The half-life of Carbon-14 is approximately 5,730 years. If a fossilized bone is found to contain 25% of its original Carbon-14, what is the approximate age of the fossil?
Which of the following geological features is most commonly formed at a divergent plate boundary?
A nurse administers a saline IV drip to a dehydrated patient. The saline solution is isotonic to the patient's red blood cells. What would happen to the patient's red blood cells if pure, distilled water were used for the IV drip instead of saline?
The command to calculate the net force on an object is: Net Force = Mass × ______. Which term correctly fills in the blank according to Newton's Second Law of Motion?