PLEASE HELP! BRAINLIEST TO FIRST CORRECT!
1. Which of these is a heavy element in a star?
Lithium
Helium
Hydrogen
Carbon

2. Which is the first stage in the life cycle of a massive star?
White Dwarf
Red Giant
Black Hole
Nebula

3. Why are spectral lines useful in classifying stars?
They show the layers the lay make up a star
They show the composition of a star
They indicate a stars age
They show a stars location

Anybody who knows ap biology, can you friend or message me

Explain the difference between incomplete dominance and codominance

Astudent wants to test the hypothesis that fertilizer improves the growth rate of grass seeds. to test this hypothesis, the student put the same amount of grass seed in 3 containers with the same type of soil. the student measured the growth at the end of the week. all plants received equal amounts of water and sunlight. if you were asked to graph this data, what would you place on the x-axis? a. fertilizer b. water c. plant growth d. week one