Which astronomer spent 20 years plotting the positions of the planets

Hybrid plants usually have increased Vigar true or false

Why magnetic substance doesnot show magnetic property?

Which of the following is a unit of energy found in food? a). vitamin b) calorie c) nutrient d) water

When salt and water are mixed, they form a solution like in the ocean. When sand and water are mixed, they form a mixture where the sand does not dissolve. Which statement might summarize this observation? A) Mixtures and solutions are the same.

Glassy and metallic are terms that describe what mineral property? A. luster B. color C. shape D. hardness

The period of a 440 Hertz sound wave is __ seconds. 1/440 1/220 220 440

Match the term to the correct description. ~A type of circuit where part of the loop is broken. ~The flow of electrons. ~A loop that creates a pathway for electricity to follow. ~A type of circuit with only one path for the electricity to follow.

What is the mass of an object that is accelerating at 10 m/s^2 when a force of 2,386 N is exerted

According to the U. S. Green Building Council, what percentage of the world's energy use and greenhouse gas emissions can be attributed to buildings?

Magnets are often fitted to the doors of refrigerators and cupboards WHY?