If we increase our food intake, we generally gain weight. nutrition scientists can calculate the amount of weight gain that would be associated with a given increase in calories.

1 It is hard to imagine how big a billion is. A billion is 1 000 000 000 (or one thousand million). There are 1 000 millimetres in 1 metre and 1 000 metres in 1 kilometre. How many millimetres are in 1 kilometre?

What is considered the brain cells of the immune system?

Describe the nonliving components of the environment in an ecosystem?

Wich of the following is an example of a solution? a. fog b. sodawater c. milk d. mud

How much genetic information do gametes carry?

What do enzymes react with? A. the products of chemical reactions B. the active site of the plasma membrane C. proteins in the cytoplasm D. a specific substrate

Isaac watched a movie where a tsunami washed across the coastline. He related the incident to the geology of the ocean he learned at the school. Which geological phenomenon did Isaac relate to? A. plate tectonics B. upwelling C.

How do mutations affect an organism? A. they may cause the development of a disease-causing allele B. they may cause the development of a more beneficial allele C. they, in some cases, may have no noticeable affect D. all of the above

Scientists make two types of observations that can be either

Of the following muscle types, which has the longest muscle cells and has obvious stripes called striations? Of the following muscle types, which has the longest muscle cells and has obvious stripes called striations? a. cardiac muscle b.