Answer:
C
Explanation:
Volcanic eruption spews volcanic ash into the atmosphere that lingers and blocks out sunlight for months. This causes photoautotrophs to decrease in population numbers due to the inability to photosynthesize. This will negatively affect the heterotrophs that depend on the autotrophs for energy.
Answer:
B
Explanation:
There are usually dominant and recessive alleles. The dominant alleles mask the expression of the recessive allele. Therefore, whenever an offspring has a dominant allele of a gene, it will be expressed whether in homozygous or heterozygous form.
Answer:
B
Explanation:
A limiting factor is an element whose abundance affects the growth and distribution of a population of a species in an environment. In this case, increasing the levels of Nitrogen in the environment increases the population size and vice versa.
Answer:
C) Reflects the light from the sun
Explanation:
Moon does not emit its own light. The moonlight is primarily the sunlight that is being reflected form the surface of moon. The moon is actually quite black so only a little amount of sunlight is reflected back.
We see colour due to the presence of cones in our retina. When we look at the moon, the light coming from moon does not have enough intensity to excite or cone cells and thus only rod cell are get excited. As the rods can't sense colours so the moon appears white.
Answer:
Option C, ppAa is indicative of white axial flowers.
Explanation:
It is given that Purple color (P) is dominant over white color (p). Thus in order to have a flower of white color , the flower must be homozygous recessive with an allele pair having two recessive alleles.
Similarly, Axial (A) is dominant over terminal (a) flower. Thus, a flower can be axial in two cases -
a) when both the alleles are same i.e AA
or
b) when one allele is A and the other one is a i.e Aa
Considering the above cases, all possible allele combination that will produce white axial flower are as follows -
ppAA, ppAa
Thus, option C is correct
Answer:
Peristalsis is the term for the involuntary muscular contractions that propel solid and semisolid materials through the alimentary canal.
Explanation:
Peristalsis is a wave-like muscle contraction due to the involuntary movements of the longitudinal and circular muscles in the alimentary canal (digestive tract). It also occurs in other hollow tubes of the body such as the urinary tract. In the digestive tract, it begins at the upper portion of the esophagus and also occurs in the stomach and intestines.
When food is swallowed, the peristaltic waves push the food down the esophagus into the stomach. The muscles in the stomach continue the peristalsis and the food moves through the digestive tract, where it is further digested and broken down with the help of digestive juices present in the stomach and small intestine. The peristalsis is continued by the muscles of small intestines, where the nutrients in the digested food are absorbed into the bloodstream. The movement of bile from the gallbladder into the duodenum of the small intestine also occurs via peristalsis. The undigested food is then passed to the large intestine, where the peristalsis continues and it is eliminated through the anus as feces after the reabsorption of water and some minerals.
When peristalsis does not occur, it may cause disorders such as dysphagia (difficulty in swallowing foods and liquids), irritable bowel syndrome (diarrhea or constipation), esophageal spasms, gastroparesis (muscles of the stomach not moving food into the small intestine) and GERD (Gastroesophageal reflux disease).
Answer:
True I think
Explanation:
The existence of Neptune was predicted before it was based on small deviations of the motion of Saturn.
