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myrzilka [38]
3 years ago
9

Describe types of peridophyta​

Biology
1 answer:
sladkih [1.3K]3 years ago
6 0

Answer:

Pteridophyta Characteristics

Pteridophytes are considered as the first plants to be evolved on land: ...

They are cryptogams, seedless and vascular: ...

They are cryptogams, seedless and vascular: ...

Spores develop in sporangia: ...

Sporangia are produced in groups on sporophylls: ...

Sex organs are multicellular: ...

They show true alternation of generations:

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Which is not characteristics of all mammals?
alexgriva [62]

Answer:

b. giving birth to live young (viviparous)

Explanation:

Monotremes include duck-billed platypus and few other mammalian species that are oviparous. These mammalian species do not give birth to young ones, that is, they are not viviparous. Rather they lay eggs and are oviparous.

These species are also characterized by the absence of teeth. The primitive monotremes also exhibit external fertilization.

Examples of egg-laying mammals include anteaters or echidnas and the duck-billed platypus. The laid eggs are carried by females in an abdominal ouch to keep them warm.

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3 years ago
A cells relatively constant internal physical and chemical conditions are called
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This is called Homeostasis
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How many species have scientists discovered
Vitek1552 [10]
About 8.7 Million Species

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3 years ago
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Which glaciers are mainly formed near a mountain?
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Continental glacier.
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Single strands of nucleic acids are directional, meaning that there are two different ends. What functional groups define the tw
pickupchik [31]

Answer:

The functional groups that define the two different ends of a single strand of nucleic acids are:

B. a free hydroxyl group on the 5' carbon a free hydroxyl group on the 3' carbon

G. a free phosphate group on the 5' carbon

Explanation:

A nucleic acid is a polymer formed of nucleotides that are linked with a phosphodiester bond. The structure of a nucleotide consists on a phosphate group linked to a pentose (ribose in RNA and deoxyribose in DNA) that is also attached to a nitrogenous base. The nitrogenous bases are adenine, guanine, cytosine, thymine (in DNA) and uracil (in RNA).

DNA and RNA are nucleic acids which can be found in a double or single strand presentation.

Nucleic acids are synthesize in the 5’ to 3’ direction, so that is why the convention is that the sequences are written and read in that direction.

The strand of a nucleic acid is directional with an end-to-end orientation, where the 5’ end has a free hydroxyl or phosphate group on the 5' carbon of the terminal pentose, and the 3’ end has a free hydroxyl group on the 3’ carbon on the terminal pentose (ribose/ deoxyribose).

3 0
3 years ago
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