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bulgar [2K]
3 years ago
11

Which of the following statements is correct? a)All animals share a common ancestor. b)Sponges are diploblastic animals. c)Eumet

azoans have three embryonic tissue layers. d)Most animal phyla belong to the clade Radiata. e)The origin of all extant animal phyla can be traced to the Cambrian explosion.
Biology
1 answer:
Alecsey [184]3 years ago
6 0

All animals share a common ancestor.  

Explanation:

According to various phylogenetic gene sequence analysis, there are various evidences that proved all animals originated from a common ancestor.

Initially, it was stated that all organisms descended from a single cell which then gave rise to multicellular organisms. Organisms that descend from a common ancestor are closely related and grouped.

The lineage of the common ancestor can be traced in the neoproterozoic era.

The last common ancestor or the basal animal was sea sponge according to some researchers. The last universal common ancestor is called as the concestor.  

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Which of the following is not a common teratogen? a. HIV infection b. SSRI antidepressant medications c. Folic acid d. Alcohol
poizon [28]

Option C

Folic acid  is not a common teratogen

<u>Explanation:</u>

Teratogen -  Any factor that can interrupt the growth of a fetus or embryo. Teratogens may generate a birth deformity in the child. Or a teratogen may terminate the pregnancy unmitigated. The aspects of teratogens include radiation, parental infections, drugs.

Alcohol exploitation can produce mental obstacles, distortion, germination obstacles, miscarriage, and behavioral complications in newborns. Women who have not taken the hepatitis B vaccine should be held for immunization if they are at danger of sexually dispatched disease or blood appearance. The vaccine may be administered during pregnancy. SSRI antidepressant medications is also a factor of teratogen to cause deformity to fetus growth.

6 0
3 years ago
Describe how ions, water and sugar are obtained and<br> transported through plants.<br><br> 6 mark
Alona [7]

Answer:

Water and ions are obtained from soil and glucose is obtained from leaves.

Explanation:

Water and ions are absorbed by the plant through roots from the soil whereas glucose is produced in the leaves during the process of photosynthesis. Vascular bundles such as xylem and phloem transported water, ions and glucose within the body. Xylem moves water from roots to the upper water of plants such as leaves, stem etc whereas phloem transported glucose from leaves to other parts of plant.

6 0
3 years ago
The correct sequence of events occurring during transcription is
marin [14]
Firstly, the enzyme, DNA Helicase breaks the Hydrogen bonds between a specific region of the DNA molecule and unwinds the duplex DNA molecule at the targeted gene sequence site.
 Then, RNA Polymerase binds at the 3` site of the gene sequence of the sense/coding strand(only one strand) that acts as the template for mRNA synthesis. RNA Polymerase then matches free nucleotides by complementary base-pairing(A-U & C=G), working in the 5`to3` direction. Hydrogen bonds then form between the complementary bases, holding the nucleotides in place. Each free adjacent nucleotide is joined at 3` ends by Condensation reactions with the other to form Phosphodiester bonds.
Once the mRNA molecule is formed, it is separated from the synthesis complex and leaves the nucleus through pores in the nuclear envelope to moves towards ribosomes for Translation.
Lastly, the DNA double helix rewinds by forming Hydrogen Bonds.

6 0
3 years ago
How to find the number of cells in mitosis
MA_775_DIABLO [31]

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<em><u>i think this could help :) </u></em>

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<em><u /></em>

<em><u>Count the number of cells in each phase of mitosis. Add the data to the table on page 4. Calculate the percentage of cells in in each phase of mitosis. Step 2: Calculate the time an onion root tip cell spends in part of the cell cycle. </u></em>

6 0
3 years ago
How is continental crust different from oceanic crust? answer It is the solid rock layer upon which we live. It is either contin
Ipatiy [6.2K]

Answer:

Continental crust is typically 40 km (25 miles) thick, while oceanic crust is much thinner, averaging about 6 km (4 miles) in thickness. The effect of the different densities of lithospheric rock can be seen in the different average elevations of continental and oceanic crust.

Explanation:

3 0
3 years ago
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