Do plant cells contain a central vacuole and chloroplasts? Structures found in plant cells but not animal cells include a large central vacuole, cell wall, and plastids such as chloroplasts. The large central vacuole is surrounded by its own membrane and contains water and dissolved substances. Chloroplasts contain the green pigment chlorophyll and carry out […]
When was the last time a president died in office?
When was the last time a president died in office? On April 12, 1945, Franklin D. Roosevelt (who had just begun his fourth term in office) collapsed and died as a result of a cerebral hemorrhage. The most recent U.S. president to die in office was John F. Kennedy, who was assassinated by Lee Harvey […]
Why did people duel in Elizabethan times?
Why did people duel in Elizabethan times? Dueling was a popular activity in Shakespearean times although it was dangerous and illegal. Men practice dueling for self defense and personal fighting skills. It was originally taught to nobles who were training to become knights. Fencing skills were required for all upper class nobility. What causes a […]
Is Far From the Madding Crowd a true story?
Is Far From the Madding Crowd a true story? Thomas Hardy’s Far from the Madding Crowd has over the century or more since his novel was published in 1874, become a literary gem, a classic – of renowned excellence, worthy of debating how we make our way in the world. What kinds of narrative techniques […]
How can flood management be improved?
How can flood management be improved? Get our free Climate email Introduce better flood warning systems. Modify homes and businesses to help them withstand floods. Construct buildings above flood levels. Tackle climate change. Increase spending on flood defences. Protect wetlands and introduce plant trees strategically. Restore rivers to their natural courses. What can be done […]
What time did the Japanese earthquake start?
What time did the Japanese earthquake start? The magnitude-9.0 earthquake struck at 2:46 pm. (The early estimate of magnitude 8.9 was later revised upward.) The epicentre was located some 80 miles (130 km) east of the city of Sendai, Miyagi prefecture, and the focus occurred at a depth of 18.6 miles (about 30 km) below […]
How do you know when jam reaches gel stage?
How do you know when jam reaches gel stage? When you’re ready to test, place a teaspoonful of your soft spread on the plate, and place it back in the freezer for a minute or so. Take the plate out and push the edge of the spread with your finger. What is this? If the […]
What type of elements have low electronegativity?
What type of elements have low electronegativity? The elements that have the lowest electronegativity are the VIII A elements or noble gases. These elements have a theoretical electronegativity of zero. These elements are stable in their electron configuration there is not force moving the noble gases to gain any electrons. Which element has the lowest […]
What is an example of electromagnetic energy?
What is an example of electromagnetic energy? Examples are radio waves, microwaves, infrared radiation, visible light – (all colors of the spectrum that we see), ultraviolet light, X-rays and gamma radiation. Is light an electromagnetism? Light as a wave: Light can be described (modeled) as an electromagnetic wave. This changing magnetic field then creates a […]
What are seismic body waves?
What are seismic body waves? A body wave is a seismic wave that moves through the interior of the earth, as opposed to surface waves that travel near the earth’s surface. P and S waves are body waves. Each type of wave shakes the ground in different ways. What causes P and S waves? Both […]