According to the phylogenetic tree, which phylum of organisms are most closely related to chordates?

1 answer:

6 0

I believe the answer is echinodermataechinodermata and Chordata have a very similar embryonic development; tirhe first opening (the blastopore) becomes the anus, while in protostomes it becomes the mouth and several similarties in the formation of skeleton.It is predicted that Echinodermata and Chordata evolved from the same ancestor

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Q2. Fill up:

Liono4ka [1.6K]

(a) The serum is the plasma without clotting factors.

(b) Phagocytic cells are neutrophills and monocytes.

(c) Eosinophils are linked with allergic reactions.

(d) In clotting, calcium ions play an important role.

(e) In an ECG, one can determine the heartbeat rate by counting the number of QRS complex.

<h3>EXPLANATION:</h3>

»» Blood without blood corpuscles is called plasma and plasma without clotting factors is called serum.

»» The professional phagocytes include many types of white blood cells (such as neutrophils, monocytes, macrophages, mast cells, and dendritic cells).

»» Eosinophils are associated with allergic reactions.

»» Calcium ions play a significant role in clotting.

»» When the cardiac rhythm is regular, the heart rate can be determined by the interval between two successive QRS complexes.

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2 years ago

Which of the following best describes what causes water molecules to exhibit properties such as cohesive and adhesive behavior?

Norma-Jean [14]

Water molecules are polar, having partially positive and partially negative ends.

4 0

3 years ago

Read 2 more answers

1. Your unique genetic identity comes from three different events; crossing over, random alignment, and random fertilization. Ex

svetlana [45]

Answer:

Crossing over and random alignment are the events of meiosis-I that add new gene combinations to the gametes. Random fusion of male and female gametes is called random fertilization.

Explanation:

During the pachytene stage of meiosis-I, part of the chromatids of each of the homologous chromosomes of a bivalent is broken apart and exchanged. This exchange of the genetic material between the members of a bivalent is called crossing over. The recombinant chromatids formed by crossing over have new allele combinations that were otherwise not present in the parental chromatids.

During metaphase I, the homologous pairs are aligned at the cell's equator in a random manner. This means that either the paternal or maternal chromosome of a pair may face one or the other pole of the cell. The arrangement of chromosomes during metaphase-I determines whether the paternal or maternal chromosome of each pair would be distributed to one or the other pole of the cell. This random segregation creates new gene combinations in gametes.

All the gametes have equal chances of getting fused with a gamete from the opposite gender. This is called random fertilization and further adds variations.

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3 years ago

Prevention measures are difficult to determine for which nervous system issue?

jenyasd209 [6]

Answer:

All of the above. is correct

Explanation:

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2 years ago

What is the correct and safest method of picking up a hamster? A. Grasp it by placing your thumb and index finger around its low

maxonik [38]

the answer is B. grasp the loose skin on the back of its neck