For natural selection to happen <span>there must be genetic variation in the population for it to even work</span>
In order to be classified as a living thing an organism must share or have the characteristics that define for what a living thing is ought to be, can grow and develop, can respond to stimuli in the environment, and more.
The most fundamental are that organisms must be composed of cells, regardless whether that it is prokaryotic and or eukaryotic. All living things must be made of cells.
Plasmodium is a monocellular parasite causing malaria to humans. The parasite's life cycle always includes two hosts, an insect host and a vertebrate host. The parasite's cells are injected into the vertebrate's (human in our case) bloodstream by the insect host (mosquito). There are several stages in its life cycle but the sexual reproduction occurs only in the insect. In the insect, gametocytes (haploid gametes) merge and form a zygote which in turn becomes an oocyst. Oocysts divide multiple times and that way a great number of sporozoites is produced. These sporozoites travel to the salivary gland of the mosquito and are injected into the bloodstream of the second host, the human. In humans, sporozoites infect liver cells and red blood cells.
According to this information, the four statements about Plasmodium which are true are:
-Plasmodium cells are transferred to human cells through mosquito saliva.
-The complete life cycle of Plasmodium requires two hosts.
-Plasmodium cells infect two specific types of cells in humans.
- Inside an infected mosquito haploid gametes fuse, forming a haploid zygote that develops into an oocyst.
The answer is; a high neutron-proton ratio
Isotopes have the same number of protons (atomic number) but differ in the number of neutrons (hence also in their mass numbers). Isotopes are named according to their mass numbers; example carbon-12, and carbon-14. Their atomic numbers remain as 6 but neutron numbers differ (6 and 8).
