Mars, Mars supplies all the plants with carbon dioxide, since they have no oxygen of their own
You may have to enlarge it but here you go!
Answer:scyphozoa
Explanation:cniderians are aquatic animals.they have radial symmetry, that is they can be divided into two halves through any plane.
Cniderians may have nematocyst,which are stinging cells.
They have two forms,which are polyp and Medusa .
There are four classes of cniderians;hydrozoa, scyphozoa,cubozoa and anthozoa.
Scyphozoa are predominantly medusa,which is umbrella shaped.they are jelly fishes.
They have four or eight oral arms.
They possess four gonads and four gastric pouches .an example is the Aurelia.
Answer;
Advantages of sexual reproduction:
- It provides genetic variation.
Disadvantages of sexual reproduction:
- Not all mutations are passed on.
- It is time and energy consuming.
- The reproduction process is slow.
Sexual reproduction is a type of reproduction in which genetic information from two genders or sexes combine to produce a offspring. Both the gender produce gametes which fuse to form zygote which develops into an offspring.
There are several advantages and disadvantages associated with sexual reproduction as compared to the asexual reproduction.
The advantages are:
- It provides genetic diversity to the species.
- It naturally increases the levels of diseases resistance throughout the species.
- It can lead to the incorporation of evolutionary advancements in a population.
- It can give a rewarding experience specially in human beings as it releases dopamine in the brain.
- It also helps in improving health, growth of brain cells, relieving pain, can act as anti-depressant etc.
The disadvantages are:
- It is time and energy consuming process.
- Reproduction is uncertain as it is not a 100% successful method for producing offspring.
- Not all favorable variations or mutations are passed on to the next generation.
- Number of offspring produced is usually low.
Charles Darwin made the observations which led to the theory of evolution.
