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Elis [28]
3 years ago
7

The two basic and opposite actions that account for all muscle movements are contraction and extension.

Biology
1 answer:
Alekssandra [29.7K]3 years ago
3 0
False
Muscles are only able to contract or relax. This is why they need complementary muscles. For example, the bicep can raise the forearm, but cannot lower it. For that, the tricep is needed.
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The recent hominin fossil finds from Ileret, Kenya, negate the conventional view held since 1960 that H. habilisand H. erectusev
Citrus2011 [14]
<h2>The given statement is true</h2>

Explanation:

The recent finding of the fossils which showed that <em>Homo erectus</em> and <em>Homo habilis</em> lived side by side in eastern Africa for perhaps half a million years challenged the conventional way that these two species evolved one after the other(<em>H.habilis</em> 1.44 million years old and <em>H.erectus </em>1.55 million years old)

  • The fossils were found in Kenya and took years to prepare the specimens for study and to be sure of the identification of the species, the scientists said
  • University of Utah geologists determined the dates of the fossils from volcanic ash deposits
  • The most recent <em>Homo habilis</em> that had been known was about the same age as the earliest <em>Homo erectus</em><em>,</em> said Daniel Lieberman, a professor of biological anthropology at Harvard University, “Now we have extended the duration of the habilis species, and there’s no doubt that it overlaps considerably with erectus”
  • The fact that the two hominid species lived together in the same lake basin for so long and remained separate species, Meave Leakey said in a statement from Nairobi, “suggests that they had their own ecological niche, thus avoiding direct competition”
4 0
3 years ago
The front leg of a cat, the front flipper of a dolphin, and the wing of a bat have the same structure and order of bones. These
Kay [80]

Answer:

The bones are homologous structures

Explanation:

Homologous structures are the structure which are found similar in appearance in different organisms.

The homologous structures in different organism shows that they shared a common ancestor or they diverged from a common ancestor during course of evolution that is these homologous structures are the result of the divergent evolution.

In the given question, the bat, dolphin and the cat shows the same structure of bone which indicates that they have evolved from a common ancestor and is true as they all belong to mammals.

Thus, the bones are homologous structures is correct.

6 0
4 years ago
Many fruits contain specialized structures that are adaptations for
Anit [1.1K]
Many fruits contain specialized structures that are adaptations for The answer is D. aiding in seed dispersal.
Maple trees have fruits with "Wings" that help the gale disperse the seeds. Some flowering plants grow fleshy fruit that benefits disperse their seeds. When animals eat the fruit, the seeds pass through an animal's digestive tract undamaged.
8 0
4 years ago
Are vascular plants small
Viktor [21]

Answer: The vascular plants are set apart in two main ways: Vascular plants have vascular tissues, which circulate resources through the plant. This feature allows vascular plants to grow to a larger size than non-vascular plants, which lack these specialized conducting tissues and are therefore restricted to relatively small sizes.

3 0
4 years ago
The photo shows a cross between a plant with white flowers and a plant with red flowers. The offspring is a plant with flowers t
Elena-2011 [213]

Answer:

The correct answer is - A. codominance.

Explanation:

Codominance is an inheritance pattern that develops if there are two alleles of a particular gene in an organism and both are expressed together. It is not common as normally dominant allele masks the effect of recessive allele but here both traits occur.

Codominance is different from incomplete dominance as incomplete dominance expresses the dominant allele more than the recessive allele and expresses a mix of both.

8 0
3 years ago
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