Human gametes are _____. isogamous anisogamous oogamous none of the above

Biology

1 answer:

Alinara [238K]4 years ago

5 0

Human gametes are oogamous.

Oogamous is a form of anisogamy which best describes human gametes. Oogamous is characterized by the joining of a large, immobile egg and a small, mobile sperm for reproduction. The male gametes are extremely motile and they are usually responsible for the joining of the corresponding gametes. The wide extension of oogamy in higher animals brings about the conclusion that the high motility of the gametes makes them to perform their respective roles better than it could be performed by general isogametes

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2. Nitrogen, as it is found in the ATMOSPHERE, can be used by plants and

irina1246 [14]

Answer:

false

Explanation:

Although the majority of the air we breathe is N2, most of the nitrogen in the atmosphere is unavailable for use by organisms. This is because the strong triple bond between the N atoms in N2 molecules makes it relatively unreactive. However organisms need reactive nitrogen to be able to incorporate it into cells.

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A geochronological scale measured in Millions of Years Ago or M Y A. Mesozoic era: Triassic period, 250 to 201 MYA, first dinosa

motikmotik

Answer:

D. The first flowering plants were introduced toward the end of the Mesozoic era.

Explanation:

Following the Paleozoic Era, the Mesozoic Era or Age of Conifers began approximately 250 million years ago. This major geological era brought about the ancestors of many of the plant and animal groups still in existence today.

The Mesozoic era is marked by 3 divisions:

the Triassic Period,
the Jurassic Period,
and the Cretaceous Period.

Animals and plants slowly recovered after the mass extinction in the Permian-Triassic extinction that led to the eradication of most aquatic marine species. They evolved to exploit varying niches in their environment, leading to a boom in terrestrial animals. Over time the planet's increasingly warm climate, abundant in atmospheric oxygen and carbon dioxide, contributed to the growth of diverse megaflora, that rapidly dominated the planet's terrestrial biosphere.

By the end of the Mesozoic Era, in the Cretaceous period, flowering plants (angiosperms) largely replaced the dominant seed ferns of the Triassic, and the conifers, cycads and gymnosperms of the Jurassic.

Varied dispersal mechanisms in angiosperms co-evolved with the evolution of certain types of fauna. Plants used animal life, including herbivorous reptiles and early mammal-like species to disperse large seeds.