Which characteristics must an object possess in order to be considered alive?

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

Ais a landform that is formed at the mouth of a river from the deposition of sediment carried by the river as the water flows.

What are two ways that harvesting algae from the ocean may benefit human society? how might the harvest of algae negatively impact the ocean communities where that algae grows? how could this be prevented?