All of the above Broooooiii
The evolution is explained by principles of the natural selection is as follows:
1. Resources are scarce
2. There is a biological variation within all species.
3. There are more born that the available resources, hence competition.
4. Adaptation to the environment will likely aid survival
5. Environment will decide which is deemed fit
6. Those who are considered fit will have offspring, and those who arent will die out.
7. As time goes on, those with more successful adaptation will develop more mutation, later becoming a new specie.
When applied to the theory of evolution, our primate ancestors have developed mutation that were deemed more fit, thus creating a separate species that evolved to human beings.
X is the dominant allele / curly hair , females have two X chromosomes and males have an X and Y
Answer:
The digestive system of Frog, shark, chicken and cow are the following:
Explanation:
The digestive tract of frog is divided into foregut that consist of esophagus, stomach, duodenum, liver, pancreas, gall bladder and midgut/hindgut where intestine is present. The digestive system of frog comprise of oral cavity, pharynx, esophagus, stomach and intestine. The digestive system of chicken consist of beak, crop, proventricular, ventriculus, small Intestine, large Intestine and Cloaca. The digestive system of cow comprise of mouth, esophagus, rumen, reticulum, omasum, abomasum, small intestine and large intestine.