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NISA [10]
3 years ago
5

1. when the ______ is mature, the sporangium opens

Biology
1 answer:
maksim [4K]3 years ago
5 0
1. b. Pollen 
2. c. Male
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Populations of some species of fish, insects, and crustaceans consist of both sexually and obligately asexually reproducing indi
jenyasd209 [6]

Answer:

Entirely asexual populations of animals are rare.

The cost of sexual reproduction is considered to be twice that of asexual reproduction, because sexual females produce ≈ 50% male offspring, and males typically contribute only their genes to reproduction (Maynard Smith, 1978). Following this logic, asexual reproduction should dominate unless there is greater than a two-fold advantage to sexual reproduction.

B) Factors that might maintain a given mode of reproduction might include access or availability of mates, disease, or parasites. For example, if diseases and parasites have a major effect on the population, the Red Queen hypothesis suggests that sexual reproduction would be favored

C) Sexual selection is thought to be one way by which sexual reproduction is maintained, because only fit males are able to mate. In an environment free from enemies, asexual reproduction would be favored, but are unlikely to persist over evolutionary time, because when the environment changes they will have much less ability to adapt (owing to a lack of novel genetic variation that would be provided by segregation and recombination in a sexual population).

4 0
3 years ago
PLEASE DO THIS ASAP!!!!!!!!!!!!!!!!!! 30 POINTS!!!!!!!!!!!! HELP URGENT!!!!!!!!!!!!!
klio [65]
The strands are suppose to be exactly same when replication is complete, so you would not be able to tell the difference.
5 0
3 years ago
A student graphs the movement of a motorized cart across the football field. Identify the dependent variable in this graph.
Alborosie

Answer:

Velocity.

Explanation:

The dependent variable is dependent on the independent variable. Basically, in order for the dependent variable to happen, the independent variable needs to do something first. Usually on a graph, <em>x</em> is the independent variable, and <em>y</em> is the dependent variable. In this situation, the time (x) needs to be graphed in order to track the velocity (y) on the graph.

The other answers are valid, but are not listed on the graph. Unless something is implied with a specific answer (like saying that speed and velocity are considered one on one side of the graph), the other answers wouldn't be correct.

I hope this helps.

8 0
3 years ago
Read 2 more answers
What is the site of action for lactase,maltase and sucrase?/?
castortr0y [4]
Hi Aasharma,

The site of action for lactase, maltase, and sucrase is the small intestine.

-AS
7 0
3 years ago
Biomes are defined as the world's major communities, classified according to the predominant vegetation, and characterized by ad
Ganezh [65]
The statement is true
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3 years ago
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