What type of reaction is combustion of coal? A. endothermic B. physical C. heat-absorbing D. exothermic

The health, management and conservation of biodiversity, is a challenge facing ecosystems worldwide. the major factors that affect the health and function of the great barrier reef are climate change and pollution. which question investigates the effects of a biotic factor on the reef ecosystem?

If a robot fixed another robot is it a engineer or doctor?

Which of the following types of rock would most likely contain a fossil? slate granite lava rock limestone