Answer;
Seedless plant.
The fossil of a plant reveals that it produced spores that were used for reproduction. It was a seedless plant.
Explanation;
-Seedless vascular plants are plants such as fern and horsetails, liverworts, mosses; which contain vascular tissues, but do not produce flowers or seed.
-These plants reproduce using haploid , unicellular spores instead of seeds.
-These plants have life cycles with two distinct stages; one in which spores are produced and one in which sex cells are produced.
Answer: The correct answer is b. Syphilis.
Syphilis is a type of sexually transmitted disease and the causative agent is bacteria called Treponema pallidum. There are four stages of syphilis: primary, secondary, latent and tertiary. It is a highly contagious disease.
The disease starts to get spread from sores and the pregnant women can pass the disease to the child and can cause abnormalities or even death of the child. If syphilis is untreated till the tertiary phase, it can lead to problems in heart, blindness, deafness, brain, nerves leading to paralysis and even death.
<span>The appropriate response is species. It is frequently characterized as the biggest gathering of life forms in which two people can create ripe posterity, normally by sexual propagation. An animal varieties is given a name when a sort example is portrayed formally by a researcher, in a paper that allocates it a logical name.</span>
Answer:
Nitrogen 15, N15 isotope,
Explanation:
Generally Nitrogen has two isotopes N14 and N15. The N14 has 7 protons and 7 neutrons with the atomic mass of 28( n+p). However the N15 has 7 protons and 8 neutrons.Since Neutrons are heavier than protons and constituted greater percentage of the atomic mass of an element the N15 isotope is heavier than the N14 isotope.
Therefore, Ammonium chloride solution containing the labeled heavier N15 was initially added to the bacterial growing medium; so that the bacterial can use it to make their DNA, and divided manytimes so that N15 isotopes is fully incorporated Therefore the DNA strands which incorporated this will be heavier,(old) and easier to segregate to the lower band during centrifugation , for identification compare to the newer lighter ones.
<u>Thus the parent( </u><u>heavy/old</u><u>) containing DNA N15 and( New/light) in the daughter DNA N14 strands can easily be separated for identification during semi- conservative replication.</u>
Answer:
<em>The five species are: Pantoea, Stapylococcus, Ustilago, Gibberella and Arabidopsis.</em>
Explanation:
<em>Because they have identical amino acid sites and sequence alignment with the aphid sequence. So the five especies are: Pantoea, Stapylococcus, Ustilago, Gibberella and Arabidopsis.</em>