The echinoderm with long spines
belongs to the class Echinoidea which includes sea urchins, heart urchins, cake
urchins and sand dollars. This spine serves as their protective mechanism from
predators. The spines are joined to the skeleton and muscles surround it. The muscles
enable them to swivel its spines from predators.
Explanation:
Cross pollination is the transfer of pollen grains from the anther of a flower to the stigma of a flower of a different plant of the same species.
Self pollination is the transfer of pollen grains from the anther to the stigma of the same flower
Answer: Living organisms need to maintain homeostasis constantly in order to properly grow, work, and survive. In general, homeostasis is essential for normal cell function, and overall balance. For this process to function properly, homeostasis helps our body to keep both water and salt at a balance level.
Answer:
The traits are only slightly evolving due to the small changes in the genotypic and allelic frequencies between both generations.
Below is a more detailed explanation. I hope it's understandable. Please reach out if you need clarification <3
