Multiple Choice
Which energy source primarily drives the water cycle on Earth?
15
views
1. Introduction to Biology
Introduction to Biology
Struggling with General Biology?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Where in our galaxy are stars usually formed?
A
Within planetary nebulae
B
In the galactic halo
C
In giant molecular clouds
D
Inside globular clusters
Verified step by step guidance1
Understand the concept of star formation: Stars are formed in regions of space where there is a high concentration of gas and dust, which can collapse under gravity to initiate nuclear fusion.
Learn about giant molecular clouds: These are large, dense regions of gas and dust in galaxies, primarily composed of molecular hydrogen (H₂). They provide the necessary conditions for star formation, such as high density and low temperature.
Eliminate incorrect options: Planetary nebulae are remnants of dying stars, not regions of star formation. The galactic halo is a sparse region surrounding the galaxy, lacking the dense material needed for star formation. Globular clusters are groups of old stars, not areas where new stars are formed.
Focus on the correct answer: Giant molecular clouds are the primary sites of star formation in galaxies, as they contain the raw materials needed for the process.
Relate this to the Milky Way: In our galaxy, the Milky Way, giant molecular clouds are typically found in the spiral arms, where star formation is most active due to the abundance of gas and dust.
1:28mWatch next
Master Introduction to Biology Channel with a bite sized video explanation from Jason
Start learningRelated Videos
Related Practice
Introduction to Biology practice set
Problem sets built by lead tutorsExpert video explanations