Glacial periods are demonstrated by large drops in temperature and CO2 followed by a rapid rise. How many major glacial periods have there been in the last 400,000 years?

Agroup of plant cells was exposed to radiation, which damaged the chloroplasts and caused them to lose function. if the mitochondria were unharmed, what would happen to the overall function of the plant cells? a. the cells would not be able to make food, but would be able to release energy from biomolecules. b. the cells would not be able to replicate dna, but would be able to break down waste. c. the cells would not be able to break down waste, but would be able to replicate dna. d. the cells would not be able to release energy from biomolecules, but would be able to make food.

Speed is the ratio of the distance of an object moves to

Fredrick griffith made a scientific discovery in 1928