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a_sh-v [17]
2 years ago
6

An important challenge to traditional (pre-1860) ideas about species was the observation that seemingly dissimilar organisms suc

h as hummingbirds, humans, and whales have similar skeletal structures. This most directly suggested to biologists that _____.
Biology
1 answer:
katen-ka-za [31]2 years ago
6 0

Answer:

Dissimilar organisms might have evolved from a distant, common ancestor.

Explanation:

First of all we should know species. Species is considered as a basic unit of taxonomic classification of an organism.

Initially, the scientists are agreed on this phenomenon that all distinct species are evolved gradually from common ancestor. Today, the species which are different from each other just like hummingbirds, humans and whales are from the same ancestor but with the time passage genetic mutation occurs and at the end dissimilar organisms we can see in our environment/surroundings.

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What evidence links echinoderms, hemichordates and chordates to the same evolutionary lineage?
sleet_krkn [62]

Answer:

Embryological evidence

Explanation:

Deuterostomes is a group that includes echinoderms, hemichordates, and chordates. Although these animals exhibit a wide variety of body plans, they share a mouth secondarily formed during embryo development, which it is believed to be an evolutionarily derived character present between a common ancestor and all its descendants (i.e., a synapomorphy). This oral cavity is formed by the invagination of the ectoderm layer opposite to the blastopore of the gastrula.

5 0
2 years ago
Which of the following statements best identifies these two cells?
svetlana [45]

Answer:

Which cells

Explanation:

7 0
2 years ago
2.) From where do lion cubs get their chromosomes? How does this happen to produce the pattern that you see?​
Vlad [161]

Answer:

This question is incomplete

Explanation:

This question is incomplete.

However, lions have 38 chromosomes (19 pairs) and <u>there cubs get their chromosomes from there parents</u>; with each parent donating 19 each. They also have a pair of chromosomes known as sex chromosomes (X and Y). The female always donates the X chromosome and the male donates either a X (which leads to a female cub) or a Y (which leads to a male cub), just like in many mammals.

NOTE: Chromosomes are threadlike structures in the nucleus of a cell that carry/stores genetic materials/genes.

7 0
2 years ago
In a PCR reaction, a few seconds at high temperature disrupts the ____ that hold the two strands of DNA together, so every molec
Andrews [41]

Answer:

Hydrogen Bonds

Explanation:

In the polymerase chain reaction (PCR) the temperature rises to 90 ° C - 95 ° C, to break the hydrogen bonds, which are the types of bonds responsible for pairing the two strands of DNA, this process is known as denaturation of DNA.

The DNA is extremely stable, due to a large number of bonds (hydrogen bonds) that form between the two strands. If the temperature decreases, these bonds will begin to recompose, until the DNA returns to its original state

7 0
2 years ago
Use the drop-down menus to identify the labeled organelles in the plant cell to the right.
nydimaria [60]

The plant cell is the smallest living structure and constituent unit of all plants. Its size and shape vary by function. It is composed of several organelles, all useful to its activity.

The right answers are: (the numbers are in the picture).

1 refer to a vacuole.

2 refer to a cell wall (if you see closer, the arrow is aiming the green layer, the yellow one is the cell membrane).

3. refer to a chloroplast.

4. refer to mitochondria.

6 0
2 years ago
Read 2 more answers
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