Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.) Valves also help blood travel back to the heart against the force of gravity.
The answer is (b.) enables the light dependent reactions to occur.
Photosynthesis is the process of converting light energy from the sun into chemical energy. Thylakoids are the site of light-dependent reactions. Thylakoids consist of thylakoid membrane where the light dependent reaction occurs.
Answer:
DD TT
Explanation:
They are the same and capital
A model shows rays of the sunlight moving straight from the sun perpendicular to the surface of the earth. So, these rays are called <u>angled rays.</u>
An angle ray is formed when the two rays are merged together at their starting point, such that the other ends of the rays extend infinitely. The point where the two rays are joined or merged is the vertex of the angle.
Perpendicular means the two different rays or lines intersecting each other at the right angle (90°) are called perpendicular rays or lines.
Hence, the correct answer will be option (a)
Learn more about angled rays here
brainly.com/question/24830815
#SPJ4
Answer:
Transcription factors.
Explanation:
Transcription and translation are the two important process involved in the gene expression of a particular protein. Transcription is the formation of RNA and translation is the formation of proteins.
Transcription requires different enzymes and transcription factors. Transcription factors are important factors that regulates the expression of transcription and may increase or decrease the process of transcription. Here, the protein that binds with dioxin acts as the transcription factors as it regulates the gene expression.
Thus, the correct answer is option (3).