<span>The heavy metals and toxins could affect the food web and reduce biodiversity.
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Amniocentesis or amniotic fluid test or AFT refers to the prenatal diagnosis of chromosomal abnormalities and fetal infections. It is performed after 16 weeks of pregnancy. The fetal DNA from a small amount of cells from the amniotic fluid of the amniotic sac is sampled for genetic abnormalities by inserting a needle and extracting it. The fluid contains cells that are sloughed off by the fetus. They are separated from the amniotic fluid, grown in a culture and then microscopically examined for genetic and chromosomal abnormalities. The test is a reliable indicator of chromosomal abnormalities such as Down’s syndrome, spina bifida, muscular dystrophy, rh diseasetrisomy 13, trisomy 18, fragile X, Tay-Sachs disease, Hunter's syndrome and other metabolic disorders.
The answer is mutualism or letter a. The tick birds ride on the buffalo’s back and
eats the tick from its body. This
relieves the buffalo from the insects that suck on its blood. The birds have a food source while the buffalo has someone to
eat away at the ticks.
The interaction between phenotype expression and the environment is an example of enviromental influences
Phenotype exists in the same population of species called polymorphic. Polymorphism which documents Labrador Retriever colouring and genes which depends on the coated colour. Anything which depends on phenotype is genotype which includes genetic material codes molecules and structures which are not visible.
Answer:
B. often use tube feet to move around in their environment
Explanation:
Tube feet are tiny tubular projections of echinoderms on the underside (oral side). They are a member of the echinoderm water vascular system.
Tubular feet are used for feeding, breathing and shifting. They are arranged around the sides, in grooves. They work by hydraulic pressure. They are used to transfer food in the centre to the oral mouth, and may stick to surfaces. Tube feet allow certain animals to stick and travel slowly to the ocean floor. for example starfish uses tube feet for the above functions.
Hence, the correct option is B.
