1. the original source of energy for most ecosystems is the

Sun

Explanation:

Without the sun the Earth would be mildly cold, too cold for rehabilitating. All the soil would be frozen, the plans would shrivel and die, and if humans and animals don't die from cold, they'll die from lack of food.

children tend to take more after their grandparents more than their parents. it’s the dna you received that was passed down to you somewhere in your family. maybe one of your grandparents had/has straight hair and you might have gotten it from them.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]