Do all people with autism exhibit the same symptoms

No

All people with autism do not exhibit the same symptoms.

Autism is a complex developmental condition that manifests during the first three years of an individual's life. Autism occurs due to the effect of a neurological disorder on normal brain function, which then influences an individual’s social interaction skills, communication and developmental language. Autism has a range of symptoms which may be mild for some and more severe for others.  Symptoms of autism disorder include repetitive behaviors, seizures, lack of spoken language etc.

"do a testcross with a homozygous recessive plant."

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.