1. Pre-Cambrian Era.
1.1 Hadean
1.2 Archean
1.3 Proterozoic
2. Paleozoic Era.
2.1 Cambrian
2.2 Ordovician
2.3 Silurian
2.4 Devonian
2.5 Carboniferous
2.6 Permian
2.6.1 Young earth creationist claims
2.6.2 "The Great Dying"
3. Mesozoic Era.
3.1 Triassic
3.2 Jurassic
3.3 Cretaceous
3.3.1 K-Pg extinction
4. Cenozoic Era.
4.1 Paleogene
4.2 Neogene
4.3 Quaternary.
According to this phyletic lineage, Cambrian (542 to 488 million years ago) and Silurian (443 to 416) are younger than Triassic (251 to 199), whereas Jurassic (199.6 to 145.5), Cretaceous (145 to 65), and Neogene ( 23 to 2.6) came later.
Answer: Pollination, the transfer of pollen from flower-to-flower in angiosperms or cone -to-cone in gymnosperms, takes place through self-pollination or cross-pollination.
Cross-pollination is the most advantageous of the two types of pollination since it provides species with greater genetic diversity.
Maturation of pollen and ovaries at different times and heterostyly are methods plants have developed to avoid self-pollination.
The placement of male and female flowers on separate plants or different parts of the plant are also barriers to self-pollination.
Answer:
E. This population is in Hardy-Weinberg equilibrium.
Explanation:
A population in Hardy-Weinberg equilibrium maintains constant allele and genotype frequencies over generations. To obtain the Hardy-Weinberg equilibrium, none of the evolutionary forces (genetic drift, mutation, natural selection, etc.) should be operative on the gene pool as they deviate the population from the equilibrium.
According to the given information, the allele frequencies and hence the genotype frequencies in a population of butterflies are constant over two decades. This shows that the population is at Hardy-Weinberg equilibrium and is not evolving.
During meiosis, 1 diploid cell undergoes 2 cycles of cell division but only 1 round of DNA replication. The result is 4 haploid daughter cells known as gametes. Independent assortment is the process where the chromosomes move randomly to separate poles during meiosis
Virus are made up of the core of genetic material. It could be DNA or RNA. Surrounded by a protein called capsid. Viruses can attach onto other host cells and get inside them and control them. They can also be surrounded by a spiky material called the envelop.<span />
