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Elena-2011 [213]
3 years ago
13

The molecular clock has been useful to determine the phylogenetic relationships of species based on the assumption that:

Biology
2 answers:
nikdorinn [45]3 years ago
8 0
<span>The molecular clock has been useful to determine the phylogenetic relationships of species based on the assumption that they cannot be compared to non molecular methods such as comparative anatomy. The molecular clock helps us discover organisms that have a little common traits or features between evolutionary relationships.</span>
Natali [406]3 years ago
8 0

Answer:

a species lineage accumulates genetic differences over time at a constant rate.

Explanation:

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Give two reasons why the chromosome number can be used to characterise a species.
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Hello <span>Dorisspears6347
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#1: <span>A chromosome number does reflect the complexity of an organism.

#2: </span>Organisms with different numbers of chromosomes are unlikely to be able to interbreed successfully


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-Chris
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3 years ago
Which of the following tissues, cells, or structures in flowering plants is a part of the sporophyte generation and therefore di
jeka94

Answer:

Cell of and integument

Explanation:

When flowering plants reproduce by sexual reproduction, they form seeds contained into fruits. The fruit is derived from the maturation of the flower's ovary (female part) after fertilization.

A mature seed contains three generations:

  1. a diploid embryo (the new sporophyte),
  2. The embryo is surrounded by haploid female gametophyte tissue that supplies nutrition
  3. All the above structure is in turn surrounded by the seed coat (diploid parental sporophyte tissue). The seed coat is produced by integument cells to protect the embryo during its development and before its can germinate. As it is produce by it parental plant, its ploidy level diploid.

In contrast, the generative nucleus and sperm cell are part of male gametophyte (pollen grain) and therefore haploids. Synergid cell is part of embryo sac, therefore belongs to female gametophyte and thus being haploid. Finally, cell of endosperm is usually derived from the fusion between a sperm cell and one of the two female gametes present within the embryo sac, thus being triploid.

7 0
3 years ago
Compare different scientist's point of view for the theory of evolution (Lamark and Darwin)
OverLord2011 [107]
<span>Lamarck believed that organisms could acquire characteristics during their lifetime, that they could pass down to their offspring, but Darwin did not believe these traits could be passed down. Darwin proved that the species adapted to their environment through natural selection. Meaning only the one that could adapt to the changes would survive. </span>
7 0
3 years ago
Which of the following correctly describes the relationship between hibiscus flowers and bumblebees that eat hibiscus nectar and
Naya [18.7K]

Answer:

C. predation: bumblebees feed on hibiscus flowers' nectar which causes the hibiscus flowers to die

Explanation: i know u need it for da unit test at wlms

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Kidneys are often compared to filters because they cleanse unwanted waste from both frogs and humans true or false ?
PtichkaEL [24]

"Kidneys are often compared to filters because they cleanse unwanted waste from both frogs and humans" is TRUE.

Answer: Option A

<u>Explanation: </u>

Frogs also have the excretory system with two kidneys and similar to mammals. Its function is to eliminate the nitrogen product from the blood. Frogs make large volumes of dilute urine to wipe out harmful products from the tubules of the kidneys.

Tadpoles and aquatic frogs excrete the nitrogen as ammonia, but most terrestrial adults excrete it mostly as urea which is less threatening substance. A few tree frog species with little water access excrete the still less harmful uric acid.

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