2. What happens to the spectral lines of a starthat is moving toward Earth?
A. The waves spread out, and the frequency of
each line increases.
B. The waves spread out, and the frequency of
each line decreases.
C. The waves compress, and the frequency of
each line increases.
D. The waves compress, and the frequency of
each line decreases.

Answer:

The endosymbiotic event that brought chloroplast in eukaryotic cells happened after the lineage delivered.

Explanation:

The endosymbiotic theory says that the ancestral cell gains the ability of photosynthesis when it engulfed a photosynthetic bacteria and this bacteria remained in a symbiotic relationship with the ancestral cell and evolved as chloroplast in plants that can perform photosynthesis.

All the eukaryotes do not have this internal structure like chloroplast because this endosymbiotic event must be happened after the divergence of the lineage into different groups. Therefore plant cells have chloroplast and animals cell do not have.

The question is incomplete as it does not have the options which are provided in the attached picture.

Answer:

Option-B

Explanation:

The theory of the endosymbiotic origin of eukaryotes proposed that the organelles like the chloroplast and mitochondria are originated when the proto-eukaryotes engulfed the prokaryotic cells.

The chloroplast was formed in some eukaryotes instead of others as the proto eukaryotes diverged into many lineages before the origin of the chloroplast in them. One of the lineages engulfed the chloroplast and become photosynthetic organism but rest of the proto eukaryotic lineage did no engulfed the bacteria and did not possess the chloroplast.

Thus, Option-B is the correct answer.

It requires two parents, does not describe parthenogenesis in organisms.

The correct option is 4.

What is parthenogenesis?

Parthenogenesis is the process in which reproduction happens without the fertilization of sperm.

It is the development of an embryo without fertilization of the egg.

Animals such as bees, wasps, and ants, do parthenogenesis.

It includes only one parent.

Thus, the correct option is 4, which requires two parents.

Learn more about parthenogenesis, here:

brainly.com/question/9983077

Answer:

4

Explanation:

asexual reproduction means only one parent

The thyroid gland will be mostly affected in this case. The element Iodine is

the major precursor which is involved in the formation of two hormones.

Thyroid hormones

• Triiodothyronine (T3)

• Thyroxine (T4).

When an individual is exposed to radioactive iodine , it alters the production

of the hormones which leads to series of effects such as:

• Decreased metabolism
• Low body weight
• Goitre etc.

Read more about Thyroid hormones herebrainly.com/question/2469666

Answer:

In the given case, the thyroid gland will be affected the most due to the exposure of the element iodine. For the synthesis of thyroid gland hormone, T3 and T4 iodine is required. As the exposure of the radioactive iodine element is taking place, therefore, it will result in the deterioration of the thyroid gland. Radioactive iodine is generally used in the treatment of hyperthyroidism.  

However, in normal individuals, the exposure of the radioactive iodine element results in a decrease in the level of thyroid hormones below the normal level due to the destruction of the thyroid cells. The symptoms seen can be neck tenderness, swollen salivary gland, and loss in body weight.  

Answer:

It's a structural adaption.

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Here are examples of the other adaptions:

Biochemical= Being immune to scorpion poison

Physiological= Hyoid bone used for roaring

Ecological= The sand grouse has wings that can hold water in its feathers, so it can take water back to the nest

Answer:

c

Explanation:

i got it right