The reason why nost scientists thought that the first true cells formed on Earth were anaerobic is being shown in the second option :B. because there was no oxygen on early Earth. Paying attention to this fact scientists discovered that first cells were prokaryotes and greatest part of them created oxygen as a toxic by-product of their own metabolism which make them understand how the planet was provided with oxygen and made a conclusion that first cells were anaerobic.
<span>Definition of Compound. ... The type of bonds holding elements together in a compound can vary: two common types are covalent bonds and ionic bonds. The elements in any compound are always present in fixed ratios. Example 1: Pure water is a compound made from two elements - hydrogen and oxygen.</span>
Answer:
Cause thats what its called in the pokedex
Explanation:
Answer:
The proportion of a genotype (i.e., AB) in a population.
Explanation:
- Every trait is controlled by some alleles and their combinations. Allele frequency determines the frequency of occurrence of a particular allele in a population.
- It can be determined by genotype frequency or proportion of a particular genotype in a population. As a genotype is a result of various alleles coming together, its frequency can help us to calculate the allele frequency.
- For example, in a population with two alleles A and B, A allele can either occur as AA or as AB. To calculate the frequency of A we will have to calculate the genotype frequencies of AA and AB.
<span>Carriers of the sickle-cell trait are less likely to die of malaria. The gene doesn't protect against being infected with malaria, but it keeps the infection from actually taking hold. Originally, it was thought that it prevented infection altogether.</span>