What animal does not need a male reproduce?
Greenflies, stick insects, aphids, water fleas, scorpions, termites and honey bees are all capable of reproducing without males, using parthenogenesis.
Why do all organisms need to pass through a reproductive lifespan in their existence?
The life history of a species is the pattern of survival and reproduction events typical for a member of the species (essentially, its lifecycle). Early reproduction lowers the chance of dying without offspring, but later reproduction may allow organisms to have more or healthier offspring or to provide better care.
Why is Semelparity an important reproductive strategy?
It has been shown that semelparous species have higher expected adult mortality, making it more economical to put all reproductive effort into the first (and therefore final) reproductive episode.
What do species with low fecundity have in common?
Species with Type I survivorship curves usually have small quantities of offspring. What do species with low fecundity have in common? They have high parental care. As the minnow population increases in size, how will its rate of growth affect its population density?
What is man’s span of life compared to?
A male child born in the United States today will be 76.3 years old on average. This puts the male citizens of the US in 43rd place in this ranking….Life expectancy for men and women.
| Country | United States |
|---|---|
| Life expectancy males | 76.3 years |
| Life expectancy females | 81.4 years |
| Birth rate | 11.4 ‰ |
| Death rate | 8.7 ‰ |
What happens if all the organisms stop the process of reproduction?
Explanation: If all organisms stop reproducing then there won’t be next generation and eventually we will die. The animals won’t get oxygen and they will die.
Are humans semelparous or Iteroparous?
Humans (Homo sapiens) are an example of iteroparous species – humans are biologically capable of having several offspring during their lives. Iteroparous vertebrates include birds, reptiles, fishes, and mammals (Angelini and Ghiara 1984).
How do different species of organisms continuously survive?
According to Charles Darwin’s theory of evolution by natural selection, organisms that possess heritable traits that enable them to better adapt to their environment compared with other members of their species will be more likely to survive, reproduce, and pass more of their genes on to the next generation.
Why do organisms produce more offspring than can survive?
1. Organisms produce more offspring than actually survive. One reason that not all organisms survive is that there are not enough resources, things that they need, to go around. Organisms must struggle to get what they need to survive, competing against other organisms that want the same things they do.