Which of the following expected to have the highest value (gm/m²/yr) in a grassland ecosystem a) Secondary production
b) Tertiary production
c) Gross production
d) Net production​

Explain why it’s important for scientists to study the sun. list at least two challenges researchers face when examining earth’s nearest star.

Vascular plants like this one use sunlight to make food through te process of photosynthesis most food a sugar is made in the plant's leaves how does te plant move the sugar to other parts?

The image shows a sandstone formation with visible bands of different colors. what do the bands indicate about how this sedimentary rock was formed? choose two answers. a). the rock was made from more than one material. b). water was absent during the compaction and cementation process. c). sediments and other matter were deposited in layers before lithification. d). the rock was stretched horizontally by the pressure from surrounding rocks. e). layers of hot liquid in the rocks cooled and solidified at different tempatures