What is the relationship between survivorship curves and reproductive strategies?
What is the connection between survivorship curves and reproductive strategies? Survivorship curves depict the percentage of the offspring that are alive after a certain period of time. Reproductive strategies can be explained by the survivorship curves.
What do survivorship curves show?
A survivorship curve is the graphic representation of the number of individuals in a population that can be expected to survive to any specific age.
What organisms have a Type 2 survivorship curve?
For populations with Type II survivorship, the mortality of an individual does not depend on its age. Commonly listed examples of this include rodents, adult birds, and certain turtle species.
Why do humans exhibit this type of survivorship curve what factors are involved?
Humans and most mammals have a Type I survivorship curve, because death primarily occurs in the older years. Trees have a Type III survivorship curve because very few survive the younger years, but after a certain age, individuals are much more likely to survive.
What are the types of survivorship?
There are three types of survivorship curves, and they are simply referred to as type I, type II, and type III. A type I survivorship curve shows individuals that have a high probability of surviving through early and middle life but have a rapid decline in the number of individuals surviving into late life.
What type of survivorship curves do humans typically displayed quizlet?
What type of survivorship curves do humans typically display? A curve that is initially quite flat, until it decreases steeply at old age.
Which of these organisms exhibits a type I survivorship curve?
Humans and most mammals exhibit a type I survivorship curve. mortality is relatively constant throughout the entire life span, and mortality is equally likely to occur at any point in the life span. Many bird populations provide examples of an intermediate or type II survivorship curve.
What situations conditions lead to the start of primary succession quizlet?
Begins in an area without soil; or in an area of newly exposed rock, sand , or lava; or any area that has not been occupied previously by a living community. The first organisms to grow in a bare area such as a rock. Disturbance; grasses; shrubs; trees (climax community).
Which is most closely related to the hagfish?
What defines radial symmetry group of answer choices?
What defines radial symmetry? Any plane of symmetry passing through the center of the organism splits it into equal halves. No planes of symmetry exist; the organism cannot be split into equal halves. Any plane of symmetry passing through the center of the organism splits it into equal halves.
How do sponges acquire their nourishment?
Sponges do not have a nervous, digestive or circulatory system. They rely on keeping up a constant water flow through their bodies to obtain food and oxygen and to remove wastes. Cells in the sponge walls filter food from the water as the water is pumped through the body and the osculum (“little mouth”).
Which type of worm lacks a complete digestive tract?
Do nematodes have a complete digestive system?
Unlike the flatworms in which food and waste enter and exit from the same opening, nematodes have a complete digestive system. An animal with a complete digestive system has a mouth at one end, a long tube with specialized parts in the middle, and an anus at the other end.
What is the advantage of a complete gut?
Complete digestive systems are better able to absorb nutrients, since each organ is separate and can specialize. It also allows for continuous intake of food, which lets animals grow bigger and develop more complex structures.
Do echinoderms have a complete digestive system?
Echinoderms also lack a centralized nervous system. They have an open circulatory system and lack a heart. On the other hand, echinoderms have a well-developed coelom and a complete digestive system. Echinoderms use pheromones to communicate with each other.
Which animal has the most complex digestive system?
Do earthworms have a complete digestive system?
Earthworms have a complete digestive system, one which has two openings, the mouth and the anus. The planarian has a cul-de-sac gut with only one opening. This means that earthworms can process food continuously and planarians must finish digesting their food before they can remove the digestive waste and eat again.
Do snails have a complete digestive system?
The Main Digestive Gland Other than the human liver the snail’s main digestive gland not only produces digestive fluids and stores nutrients. It also performs digestion as such and resorption, which means it extracts nutrients from the digested food.
How many hearts does a worm have?
Heartbeats: Worms don’t have just one heart. They have FIVE! But their hearts and circulatory system aren’t as complicated as ours — maybe because their blood doesn’t have to go to so many body parts. Moving around: Worms have two kinds of muscles beneath their skin.