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kramer
3 years ago
14

Which group of invertebrates is most closely related to vertebrates?

Biology
1 answer:
MissTica3 years ago
4 0

Answer:

cephalochordates

Explanation:

Cephalochordata is one of the subphylos of the phylum Chordata with about 30 species. Cephalocords are small (centimeter long) animals, thin, laterally flattened (like the body of fish), transparent and live buried in sandy substrates leaving only their heads apparent. They are currently represented by the amphioxes. Cephalocords are the group of invertebrates that is most related to vertebrates.

The body of the cephalocordates is composed of longitudinal (horizontal) muscles that are divided by blocks called myotomes. The notochord holds in adults giving a stronger structure to the body.

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Alligators in a Florida lake polluted by high levels of dioxins (chlorinated hydrocarbons) had lowtestosterone levels and failed
natka813 [3]

Answer:

1. Endocrine disrupters

Explanation:

Endocrine disrupters are chemicals that alters or interrupts the normal functioning of the endocrine system that consists of several glands that produce hormones responsible for various functions such as metabolism, reproduction, growth, etc. When this interferes with the endocrine system, it can bring about many undesirable consequences, one of which is low testosterone levels as reported in the Alligators in Florida lake that is polluted by high levels of dioxins. These chemicals act as endocrine disrupters.

5 0
3 years ago
A student is measuring the effect of different temperatures on the effect of enzymes in biological systems. What temperature ran
viktelen [127]

Answer:

A. 25 °C, 30 °C, 35 °C, 40 °C, 45 °C  

Explanation:

Each enzyme has a temperature at which it works best. In humans and many animals, that temperature is around body temperature (37 °C or 98.6 °F). Most enzymes are denatured and work poorly at 40 °C (104 °F).

That automatically eliminates Option B.

I would pick a temperature close to 37 °C (98.6 °F) and temperatures at intervals above and below that.

Option D is wrong because it includes no temperatures above body temperature.

Option C is wrong, because it includes temperatures of 45 °C and 55 °C, at which the enzymes will be denatured.

That leaves Option A as the best answer. It includes only one temperature above 40 °C.

8 0
2 years ago
The middle layer of the meninges that surround the brain and the spinal cord is known as the __________.
Leni [432]

arachnoid

a fine, delicate membrane, the middle one of the three membranes or meninges that surround the brain and spinal cord, situated between the dura mater and the pia mater.

5 0
3 years ago
What should you do during a tornado if you are already inside a building such as a house or a school?
kodGreya [7K]
Go somewhere where there aren't any windows
5 0
3 years ago
Read 2 more answers
An individual's complete collection of genes is called his or her:
BabaBlast [244]

The right answer is genotype.

The genotype is the information carried by the genome of an organism, contained in each cell in the form of deoxyribonucleic acid DNA. Carried by the chromosomes, it is located inside the nucleus in eukaryotes and in cytoplasm in prokaryotes.

In humans, it is estimated that the number of genes is between 25,000 and 30,000.

7 0
3 years ago
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