This table list traits of four types of vertebrates. Each trait first appeared in a common ancestor of the animals that evolved later. These traits are used to build a branching diagram. Based on the information in the table, which animal belongs in the spot labeled A on the branching diagram?

A. Tuna
B. Frog
C. Robin
D. Shark

Would really appreciate it, i have an idea but not completely sure

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

The is an estimate of the fewest number of organisms a population needs to avoid extinction. this measurement will most if the number of offspring each female in the population produces increases. if the population's this measurement will most likely increase. 1 population density, minimum viable population, carrying capacity 2 decrease, be unaffected, increase 3 death rate increase, dead rate decrease