is the following sentence true or false? an average star spends 90 perecent of its life as helium burning main sequence star

Why do biologists measure the number of trophic levels in an ecosystem?

8. How does the atmosphere act as blanket? State difference between lithosphere and Biosphere?

Diffrence between internal and extarnal fertilization

What would most likely happen to a person if they lacked amino acids in their diet?

What does a catalyst do

A mutation occurs in the sex cells of a full-grown zebra. The mutation affects the genes responsible for producing blood proteins. What will most likely happen to the zebra?

Malignant tumors are classified according to A. how quickly they divide. B. how quickly they spread. C. the type of cells that give rise to them. D. the type of cells they are most likely to spread to.

Which of the following statements is TRUE about vitamin and minerals? a. Vitamin D is a water-soluble vitamin that is stored as hydroxycholecalciferol and released so that bones and teeth form normally. b.

A blank reaction occurs when ionic or comment bond are broken and elements ions or simpler molecules are formed

The phase in which DNA copies itself