During the full moon and new moon.
DOUBLE HELIX describes the structure of the DNA
Answer:
The simultaneous effect of a predator population on a prey population and a prey population on a predator population over time.
Explanation:
The mathematical models of Lotka-Volterra equations explain the existing interaction between species in which prey and predator influence and affect each other. The model follows a few assumptions,
- The ecosystem is isolated and closed. There is no migration.
- The whole individuals are reproductively equivalent.
- In the absence of the predator, prey shows an exponential growth rate. The prey is in the ideal environment.
- When there is no prey, the predator population decreases exponentially because of the lack of food. The predator environment is ideal, but it is limited by prey density.
- The predation rate is proportional to the encounters rate, which also depends on density.
- The predators affect the prey populations, inducing its decrease proportionally to the number of prey and predators present.
- The prey population also influences the predator population proportionally to the number of encounters between the two species.
In these equations, the variable D is the number of predators, and P the number of prey items.
The parameters are always constant:
• r1: prey growth rate.
• a1: predator hunting success.
• r2: predator growth rate.
• a2: the success of the predator in hunting and feeding.
In nature, many factors affect interactions, such as dense-dependent factors and dense-independent factors. Also, in reality, there are stochastic factors. Stochasticity refers to the variability in the system involving those factors that are affecting or influencing population growth. Stochasticity might be related to good years and bad years for population growth.
In real situations, the compliance of the whole assumption does not occur. The previously mentioned constants might vary, constantly changing the interaction between the predator and the prey. These parameters change in different degrees, resulting in varying circumstances for both species.
The diagram for evolution of plants in the 4 stages is attached below.
<u>Explanation:</u>
The plants evolution has 4 main periods:
<u>A. 1st Period of Plant Evolution
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About 420 million years ago, plants evolved from algae. Formation of cuticle was the first terrestrial adaption.
<u>B. 2nd Period of Plant Evolution
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Abut 400 million years ago, the diversification of vascular plants came into being. The early vascular plants lacked seeds.
<u>C. 3rd Period of Plant Evolution
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This was around 360 million years ago, that the seed evolved. The plants had seeds, but they did not have any covering, so they were called naked seeds. These plants were gymnosperms.
<u>
D. 4th Period of Plant Evolution
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This was the evolution of flowering plants, happened around 130 million years ago (during early Cretaceous period). The flowering plants were called angiosperms.
Answer:
75% of kids will be homozygous with blood type AB
25% of kids will be homozygous with blood type B
Explanation:
I'm so sorry if this is wrong this is just what I remember from 8th grade
