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ValentinkaMS [17]
3 years ago
8

Which characteristic is shared by all mollusks and echinoderms?

Biology
2 answers:
Romashka [77]3 years ago
6 0
Some characteristics that is shared is a soft body and an outer shell to protect their body. 
mezya [45]3 years ago
4 0

Both molluscs and echinoderms have the organ system grade of organization. Organ systems such as nervous systems, digestive systems are present. They are triploblastic and are coelomate animals. Both molluscs and echinoderms possess circulatory systems that are predominantly open, symmetrical bodies (radially symmetrical in echinoderms, bilaterally symmetrical in molluscs).

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Which best explains why noble gases are chemically unreactive
vesna_86 [32]
<span>They have very stable outer electron shells</span>
3 0
3 years ago
The sickle-cell allele produces a serious blood disease in homozygous recessive individuals. why doesn't natural selection elimi
icang [17]

No, the sickle-cell anemia allele won't be eliminated by natural selection.

Sickle-cell anemia trait is controlled by a single gene and the allele (S) for sickle-cell anemia is a harmful autosomal recessive.

It is caused by a mutation in the normal allele (A) for hemoglobin (a protein on red blood cells).

Heterozygotes (AS) with the sickle-cell allele are resistant to malaria, a deadly tropical disease. It is common in many African populations.

In these areas, (S) carriers have been naturally selected, because their red blood cells, containing some abnormal hemoglobin, tend to be in sickle shape when they are infected by the malarial parasite.

Therefore, they are more likely to survive and reproduce. This keeps the S allele in the gene pool.

Learn more about Sickle-cell anemia on

brainly.com/question/14505007

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3 0
1 year ago
As the human population continues to grow, humans cut down trees to build homes, shopping malls, and roads. Which part of the wa
Elan Coil [88]

Answer:Transpiration

Explanation: water cycle is the continuous movement of water on the Earth to ensure the availability of water.water is a universal solvent that is essential for the survival of living things.water cycle ensure that clean water is available.plants require water which is gotten from the soil.water is lost from the leaves of trees through transpiration.transpiration may also occur through the lenticels and stomata of stems.

the movement of water through the plant is called transpiration pull.this is responsible for the pull of water into the leaves.it increases the absorption of minerals from the soil and also cools the plant.

This water vapour that transpire from the plant,is condense as clouds, which then falls to the Earth as rain and the water cycle continue

3 0
3 years ago
Describe both innate and acquired immune systems and the importance of vaccines.
lbvjy [14]

Answer:

Innate immunity is a non-specific immune system which provides defence against any pathogenic microorganism in early stages. It includes physical barrier such as skin, chemical barriers such as saliva, tears, et cetera, phagocytic cells such as macrophages, et cetera.

Acquired immune system is the one which develops after exposure to pathogen or antigen. It is highly specific in nature. It includes B-lymphocytes and T-lymphocytes. It includes the production of antibodies.

Vaccines are used to develop acquired immunity in people. The process is termed as vaccination or immunisation. Heat-killed or weakened pathogen or antigen is inserted into a person after which a person develops antibodies and memory cells against that pathogen or disease. So, the immune system acts more vigorously against that pathogen in secondary infection.

Thus, a person becomes immunised.

3 0
3 years ago
4. Do Eukaryote and Prokaryote both have cell membranes?
PtichkaEL [24]

the answer is yess hope it is

8 0
2 years ago
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