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diamong [38]
4 years ago
13

Some planktonic cyanobacteria (blue-green algae) have the ability to "fix" _______ thus having a fertilizing effect on the marin

e environment (similar to the ability of legume plants found on land).
Biology
1 answer:
nevsk [136]4 years ago
7 0
The ability to fix nitrogen
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A woman and a man are both heterozygous for a recessive allele for a rare genetic disease. If they have one child, what is the p
omeli [17]

Answer:

Probability that at least one of them will be affected = 3/16 + 3/16 + 1/16 = 7/16

Explanation:

If both parents are heterozygous for a genetic disease; Xx and Xx

The offspring's they will produce will be as follows ; XX, Xx, xX, xx

  • Probability that first child will be affected = 1/4
  • Probability that first child will not be affected = 1 - 1/4 = 3/4
  • Probability that first child have it and second does not = 1/4 x 3/4 = 3/16
  • Probability that first child does not have it, second child have it = 3/4 x 1/4 = 3/16
  • Probability that both of them will have it = 1/4 x 1/4 = 1/16
  • Hence, Probability that at least one of them will be affected = 3/16 + 3/16 + 1/16 = 7/16

7 0
3 years ago
Match each organism with its phylum Pines Ephedra Palm-like plants Trees with fan-shaped leaves A. Gnetophyta B. Ginkgophyta C.
solong [7]

Answer:

Ginkgophyta

Explanation:

Gymnosperms are cone-bearing trees or Woody plants, which do not different greatly in their structure from the Woody angiosperms. Gymnosperms do not produce flowers but as seed plants that bear their seeds on scale-like leaves which are arranged spirally to form cones. The seeds are termed naked seeds because they are exposed to the air on the surfaces of the cone scales.

Gymnpsperms are grouped into four major divisions namely:

*Ginkgophyta

*Cycadophyta

*Corniferophyta

*Gnetophyta

1)DIVISION GINKGOPHYTA:The ginkgo tree cared maiden hair is the only surviving member of this division. It is found in the Orient(China and Japan) where it is cultivated as an ornamental tree because of the fan-like leaves. The leaves are *fan-shaped* with long petrioles.

2)DIVISION CYCADOPHYTA:The cycads abound in the tropics, mainly as ornamental plants. They are *palm tree-like* plants with a crowded crown of palm fronds.The leaves of Cuba's are deep green,waxy with large petioles.

DIVISION CONIFEROPHYTA:This is the largest group of Gymnosperms as it includes some of most economically exploited plants such as *pines* and Jupiter's. The pine tree is important as Christmas tree and conifers are generally important in the production of wood and paper

DIVISION GNETOPHYTA:This is the group of very unique Gymnosperms made up of three genera:Gnetum,*Ephedra* and Welwitschia.

Ephedra is a profusely branched shrub found in desert regions. It has whorl-like, scale-like, or needle -like leaves and jointed stem.

Hence, matching each with its phylum, we have:

Gingkophyta:Fan-shaped leaves

Cycadophyta-Palm-like leaves

Coniferophyta:Pine

Gnetophyta:Ephedra

5 0
3 years ago
In a lake with three trophic levels (non-native fish, zooplankton, algae), an algal bloom occurs when the small population of zo
tino4ka555 [31]

Answer:

Zooplankton help other populations survive by keeping out other herbivores

Explanation:

This is because a keystone species are species that have large effect on the the habitat and through its effect they help to keep the ecosystem in existence. They make sure that the ecosystem exist. They help populations survive by keeping out herbivores and feeding on the algae. They help drive nutrients cycle and transfer energy from algae to invasive fish.

7 0
3 years ago
During the process of photosynthesis which of the following is being created by producers
Kay [80]

Answer: C.Food

Explanation: In the process of photosynthesis, the chloroplasts in the cell make the food- sugar/glucose-. they do this by collecting the sunlight, water, and carbon dioxide, making the food. Any food they don't end up using is then converted to oxygen.

6 0
4 years ago
Organisms can be classified in the same species by morphology and ?
slamgirl [31]

Every species is assigned a standard two-part name of genus and species. ... Organisms are grouped into species partly according to their morphological, or external, similarities, but more important in classifying sexually reproducing organisms is the organisms' ability to successfully interbreed.

5 0
4 years ago
Read 2 more answers
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