Missing options are
A). Animals did not move on to land until flowering plants evolved.
B). Vertebrates appeared in the oceans before they moved on to land.
C). Vertebrates evolved on land and in the oceans at about the same time.
D). Shelled animals and fish appeared in the oceans at about the same time.
Answer:
The correct answer is B: Vertebrates appeared in the oceans before they moved on to land
Explanation:
The first vertebrates were fish (hagfish) and they appeared on Earth nearly 525 million years ago. During the Devonian period, 419 to 358 million years ago, they were evolved to tetrapods vertebrates (amphibians) that lead to the development of life in terrestrial habitats. These animals adapted the terrestrial environment by developing column, jaws, and a bony endoskeleton that also helped then survive against gravity. Therefore fossil record about terrestrial life is present after marine vertebrates evolved to land vertebrates.
Answer:
Viruses and bacteria helps to build up our immune system, specifically our adaptive immune response such that we will be able to eliminate such pathogens when our body comes into contact with them. This builds up the resilience of our immune system over time, similar to how vaccines work.
Answer:
"A hormone is like an e-mail with instructions from someone's boss" is the best description to define a hormone.
The digestive system and how to find out the symtoms
