Explanation:
in dim light the iris contract ,the the pupils widens to allow more light to enter the eye,in bright light the iris relaxes and size of pupil becomes smaller to reduce amount of light entering the eye. NOTE: the muscle do not expand they either contract and relaxes
The correct answer is Option: B) Implantation
Implantation is defined as the attachment of fertilized egg or blastocysts to the wall of uterus at the beginning of pregnancy. Occurrence of implantation ensures the women to be described as pregnant.
Other options are wrong.. e.g. Intercourse is only an act between a man and a woman and does not always result in a pregnancy. On the other hand menstruation has nothing to do witha women getting pregnant.
The correct answer is option (C) transposons or jumping genes.
Barbara McClintock was an american cytogeneticist. In 1940s, she discovered the phenomenon of transposition brought about by the mobile genetic elements or jumping genes or the transposable elements. These jumping genes refers to a sequence of DNA which can change its position in the genome or the genetic constitution of an organism. She discovered these jumping genes in the Maize for the first time and received the nobel prize in 1983.
Jumping genes form a major portion of the eukaryotic genome. They are often responsible for mutations and associated with the duplication of the genetic material. They also cause the structural changes in the chromosomes like inversion, deletion and translocation which are called the chromosomal aberrations.
Answer:
Since the lipid membrane is easily disrupted by various disinfectants, enveloped viruses are generally easy to inactivate on hands or surfaces. Not so the non-enveloped viruses.Disinfectants have hard time disrupting such compact structure and many non-enveloped viruses are highly resistant.
Explanation:
The arteries get "hard" and absorb less systolic force
