Answer:
Problems associated with a declining population size include weakened economic growth.
Explanation:
Answer:
Option D, has only a single opening
Explanation:
A gastrovascular cavity has only one opening. The food goes in and comes out of the same opening there by making it a two way digestive tract.
However, a digestive tube is a one way digestive tract where the food goes in from mouth (one end) and comes out of anus (second end) . It is also called as alimentary canal
Hence, option D is correct
Answer:
The answer is d) Permian
Explanation:
The <em>Diplocaulus</em> was an animal similar to the salamander that existed during the Permian Period.
<em>Diplocaulus</em> belongs to the group of lepospondyls. Not to be confused with dinosaurs, since this animal lived long before these, this ancient amphibian disappeared when the dinosaurs began to inhabit the earth. This animal inhabited the earth during the Paleozoic Era, in the subdivision called as Permian.
Plants take the energy in sunlight and turn it into the energy in food molecules. This process is referred to as C. Photosynthesis
<span>The answer is layering. Layering is a method of plant propagation in which parts that are usually exposed to the air are kept in specific conditions until they form roots. After the formation of roots, these parts grow into new plants, genetically identical to the parent plant.</span>